The Ultimate Guide to Laminate Flooring Underlayment

Underlayment is an important step for any laminate flooring installation. There are several factors you will need to consider when choosing an underlayment. Learn more about what you should know before buying a laminate flooring underlayment.

What Is Flooring Underlayment?

It is a thin foam pad, often made of polyethylene or polypropylene, which is laid on the sub-floor before installing the laminate. Most laminate floors on the market today require an underlayment to be installed. While there are manufacturers who offer floors with an underlayment attached, this is a special feature and is not included with all products.

Laminate Flooring Underlayment Swatches
Laminate flooring underlayment is available is a wide variety of styles.

Why is Flooring Underlayment Necessary?

Laminate flooring is not nailed or glued down, so it needs some form of cushion between the subfloor and laminate to allow it to float easily. Think of it like a large jigsaw puzzle, which will be expanding and shifting as the climate changes. To avoid any damage due to friction between the laminate and your sub-floor, the underlayment must be laid first to give the laminate a smooth surface on which to float.

Silver Vapor Barrier Laminate Flooring Underlayment

Which Underlayment Should I Use?

While the concept of underlayment seems simple enough, all laminate underlayments are not created equal. Different manufactures offer many different features, which can enhance the feel and performance of your laminate floor. To help you figure out which underlayment will meet your needs, we have put together some more information on the underlayments that we offer. Before reading on, first ask yourself these two very important questions:

1. What Is Your Sub-floor?

If you are installing laminate over a concrete sub-floor, it is very important that a vapor barrier is used to prevent any possible damage due to the moisture released by the concrete. This is simply a sheet of thin plastic material, like Visqueen Vapor Block, that will stop any moisture from being absorbed into the laminate core. Many of the underlayments from Bestlaminate offer 2-in-1 or 3-in-1 underlayments, which include a vapor barrier as well as padding. This saves you the time and money associated with installing a separate vapor barrier.

If you are installing over a wood or existing subfloor, you will not need to worry about a moisture barrier underlayment. Unless you require other properties, such as sound reduction, a standard foam underlayment will work for your project.

Laminate Flooring Subfloor

2. Is This A Second Floor Installation?

If you are installing your laminate floor in an apartment, condo, or on the second floor of your home, you may want to consider an underlayment that offers noise reduction. Many apartments and condo associations require a minimum sound rating from the underlayment. While laminate flooring is quiet to walk on, noise can easily be transferred to the floor below without the proper underlayment. Choose an underlayment, like Floor Muffler or Roberts Super Felt, that will give you a high sound reduction rating.

Floor Muffler Ultraseal 2mm Laminate Flooring Underlayment
Floor Muffler Ultraseal 2mm Underlayment

What If My Laminate Has Pre-Attached Underlayment?

If your laminate flooring already has underlayment attached, you would not use another underlayment. Adding extra padding will put stress on the locking system and could cause your locking systems to break. The underlayment attached is meant to save you time from installing underlayment.

The exception to this rule is if you are installing above a concrete sub-floor. Attached underlayments will generally not have an included vapor barrier. You can install a thin vapor barrier that does not have extra padding to keep moisture from damaging your floor.

If you’re looking for a higher end underlayment with thermal or sound reducing properties, we would recommend finding a floor without attached underlayment and buying a higher quality underlayment for your needs.

Pre-attached Laminate Flooring Underlayment
Underside of Laminate Flooring Showing Attached Underlayment

Important Underlayment Terms

When reading the specifications of underlayment, you may come across terms like IIC and R-Value. These terms may leave you scratching your head, but don’t worry! Here are the most common underlayment terms explained:


While looking at underlayment for your laminate floor, you may come across STC/IIC with a number next to them. What exactly are these and what do they mean? Put simply, these are ratings that tell you how well the underlayment will dampen sound. The higher a number is following these letters, the less noise will be transmitted. The effect of this is mostly noticeable in rooms underneath the room in which the underlayment and laminate are installed. This is why many apartment buildings, commercial offices buildings, and condo associations require a minimum rating where sound is concerned.

The Sound Transmission Class (STC) and Impact Isolation Class (IIC) ratings are measured in decibels reduced for certain types of sound. The STC rating pertains to airborne noise, such as voices, radio, television, etc. The IIC rating measures impact sounds, such as footfalls, dropped objects etc. The transmission of these sounds through floor/ceiling assemblies (such as those found in multi-level homes and apartments) will be inhibited by underlayments with higher STC and IIC ratings. The International Building Code (IBC) states that all multi-family buildings must have a minimum sound insulation rating of STC 50 and IIC 50.

Thermal Ratings

In addition to the STC and IIC ratings, some underlayments may also have a thermal rating, or R-value. This refers to the underlayment’s ability to conduct heat. The higher an R-value is, the less heat will move through it. Many homeowners prefer an underlayment with a higher R-value to keep their feet warm in the winter months, however, if you have any kind of radiant heat system, a high R-value can inhibit its effectiveness.

R-values are measured in ft2*°F*hr./BTU, where °F is equal to the difference in temperature (in degrees Fahrenheit) between one side of a material and the other. An underlayment which has a value of 3 ft²*°F*hr./BTU will typically be represented as R-3. To put this in perspective, the typical R-value of a bat hitting fiberglass insulation is R-3 to R-5. Many polyethylene foam products have an R-value of 2-3, such as laminate flooring underlayments.

The Different Types Of Underlayments

Basic Underlayments

First up is our series of basic underlayments. These are the most simple, cost effective underlayments we offer at Bestlaminate. All three of our basic underlayments are suitable for most installations, though they do not offer many features. These are the most popular choices with contractors, due to their low price and effectiveness in allowing the laminate floor to float.

Standard Underlayment

The most basic option will be the standard underlayment. This is a great option for installing over plywood, oriented strand board (OSB) or existing sub-floors, where a moisture barrier is not required. The Standard Underlayment will absorb minor imperfections in the sub-floor, giving your laminate floor a smooth, even surface on which to float.

Standard Laminate Flooring Underlayment
Standard Underlayment

2-in-1 Vapor Underlayment

Bestlaminate’s 2-in-1 Vapor Underlayment is another great option for basic installations. Made from the same low-density 3mm polyethylene as our standard underlayment, the 2-in-1 has the added protection of an attached moisture barrier film. This makes it a safe choice for installing your laminate floor over concrete sub-floors. Like the Standard Underlayment, this material will fill minor imperfections in the sub-floor, giving your laminate floor a smooth, even surface on which to float.

2-in-1 Vapor Barrier Laminate Flooring Underlayment
2in1 Vapor Barrier Underlayment

3-in-1 Vapor Underlayment

The third option in Bestlaminate’s series of basic underlayments is the 3-in-1 Vapor Underlayment. Another polyethylene foam, this one is only 2mm thick, making it better to use under thinner planks. Unlike the Standard Underlayment and the Vapor 2-in-1, the 3-in-1 comes in pre-packaged rolls of 100 ft². This underlayment has an attached vapor barrier and the added feature of an adhesive strip.

Vapor 3-in-1 Blue Laminate Flooring Underlayment
Vapor 3-in-1 Blue Underlayment

All of these underlayments are low density polyethylene. While none of them have been subjected to sound or thermal testing, they do offer some sound reduction, and are suitable to use over radiant heating. The Standard Underlayment and 2-in-1 Vapor Underlayment do not come in pre-packaged rolls, and can be cut for custom orders, making them a great choice for anyone who does not want to purchase an extra roll to get that few extra feet2.

Silent Collection

Next up is our series of silent underlayments. These are the next tier in underlayments that we offer at Bestlaminate. All five of these silent underlayments are suitable for most installations where sound dampening is key. Some of these underlayments also have vapor barriers attached, so be sure to look for these as you will get more bang for your buck if you’re installing over concrete subfloors. These are the most popular choices for people living in multi-family homes or apartments, or those who don’t want to hear their children playing around upstairs.

3-in-1 Silent Vapor Barrier Underlayment

If you’re looking for something that will help to muffle sound, but won’t break the bank, the 3in1 Silent Vapor Underlayment by Feather Step™ is a great option. This incredibly durable underlayment is a 2mm, cross-linked polypropylene, giving it a higher density than the open-cell polyethylene foam underlayments. Because of this, the Feather Step™ Vapor 3-in-1 absorbs sound and offers enhanced moisture protection. The attached foil moisture barrier works in conjunction with the foam itself to ensure that your floor is protected from any vapor given off by the sub-floor. This underlayment includes an adhesive strip for easy installation.

Silver Vapor 3-in-1 Laminate Flooring Underlayment
Feather Step 3-in-1 Vapor Barrier Silver Underlayment

ProVent Silent Vapor Barrier Underlyayment by Kronoswiss®

ProVent Silent Vapor Barrier Underlayment is one of the best values where laminate flooring underlayment is concerned. This polyethylene foam is 3mm thick and comes in pre-packaged rolls of 215 ft2. An attached vapor barrier protects against moisture, but it doesn’t stop there! ProVent underlayment is specially designed with micro ridges that, when walked on, actually pump moisture out to the sides of the room to vent out moisture. This underlayment is a great choice for any job, including basements, first or second floor, apartments or condos. The Kronoswiss® ProVent can be installed over any type of sub-floor, and will absorb minor flaws, giving your laminate the proper surface to float.

ProVent Silent Vapor 3-in-1 Laminate Flooring Underlayment
ProVent Silent Vapor 3-in-1 Underlayment

Roberts® First Step ™

The First Step™ underlayment from Roberts® is one of the most popular choices in the laminate industry. Another great option for muffling sound, the Roberts First Step has an air flow layer which is similar to the Kronoswiss® Pro Vent. Polystyrene beads are substituted for a foam pad, allowing air to move freely through the underlayment to vent- preventing harmful mold and mildew build-up. This patented design also allows heat to be easily conducted, making this an excellent choice for sub-floors with radiant heat systems.

Roberts Silent 3 in 1 Vapor Laminate Flooring Underlayment
Roberts Silent 3 in 1 Vapor Underlayment

Floor Muffler® Ultra Seal

The Floor Muffler underlayment is the top of the line for sound reduction, with the highest STC/IIC ratings on the market. This makes it the number one choice for multi-family buildings around the globe. Similar to the Feather Step™ vapor 3-in-1 underlayment, the Floor Muffler® is made of a cross-linked polypropylene to give it more density. This directly contributes to its ability to cut down on unwanted noise. This also helps to block moisture, though it does not have a vapor barrier attached. The density of the Floor Muffler® underlayment keeps out any vapor released by your sub-floor, making it a safe choice to install over concrete subfloors.

Floor Muffler Ultraseal 2mm Laminate Flooring Underlayment
Floor Muffler Ultraseal 2mm Underlayment

Roberts Super Felt Premium Underlayment

Roberts Super Felt Premium Underlayment provides you with superior sound dampening, insulation and a vapor barrier. This is a superior choice for installation of laminate and engineered wood flooring. This underlayment is available in convenient rolls containing 100 sqft or 360 sqft each. Durable and easy to install, this underlayment comes with a tape strip to easily seal the rows of underlayment together.

Other Products

Visqueen – Vapor Block PE Film

Visqeen PE Vapor Block PE Film is not an underlayment, but simply a vapor barrier sheet that may be used as on concrete sub-floors. This is the perfect option if you are laying a floor which has a pre-attached underlayment on a concrete slab or any other stone floor where there is potential for moisture.

Visqueen 6Mil PE Vapor Barrier
Visqueen 6Mil PE Vapor Barrier

Along with the underlayments listed above, we have many more options for your laminate flooring underlayment. You can view all of our underlayments here.

How To Select Laminate Flooring Underlayment

Installing Underlayment

Each underlayment is a little different and has their own manufacturer instructions. You must read the instructions to fully get an understanding on how to properly install. We’ve prepared a variety of installation tutorials that will give you graphical step-by-step guides on how to install your underlayment.

View them here: Flooring Underlayment Tutorials

Laminate Flooring Underlayment Tutorials

Do you have more questions? Simply post it in our comments area. We will be happy to answer them all!

Learn More:


  1. Thanks for your question, Hershel. Unfortunately, we are unsure of the product you are using making it tough to give you advice. Vinyl and laminate are two different products; vinyl is 100% waterproof and laminate is water resistant- not waterproof. We always recommend using vinyl in bathrooms as opposed to laminate for the waterproof qualities vinyl has. If you are using a vinyl with attached underlayment, you can use Visqueen over the subfloor for a vapor barrier. Moisture will not seep between planks that are locked properly.

  2. W have a really old frame house on pier & beam, and have replaced the bathroom floor with two layers of standard 3/4″ plywood. We want to install vinyl laminate. I know we have to use underlayment, but my concern is – do we need to install some type of vapor barrier under the underlayment – between the wood floor and the underlayment? I am concerned that without it, water could seep between the edges of the vinyl laminate pieces, through the underlayment and damage the plywood subfloor. Can a 6 mil layer of visqueen be used? Or what else can we do?

  3. Thanks for your question, Sherry. We do not recommend using bubble foil insulation as underlayment as that is not the intended use for it. We would suggest using a standard underlayment to use underneath your laminate flooring.

  4. Can I use bubble foil insualtion as underlayment for laminate floors?

  5. Thanks for your question, Tim! We would suggest removing the laminate flooring before installing a vinyl flooring on top. For the best outcome with your vinyl flooring, it is important to install directly over the subfloor to ensure the subfloor is level.

  6. Thanks for your question, Lucia! It is not required to have a vapor barrier on top of the underlayment that is on top of the concrete floor. You can use a vapor barrier if you prefer, however. We have our Visqueen vapor barrier on our website, you would want to find something similar to this!

  7. Can I install vinyl plank floor on top of an existing laminate floor that in good level shape just shop in ware , and run the opposite direction of the existing

  8. Hi guys, our new built apt on the second floor has high density acoustic rubber underlay glued on top of the concrete floor. Do we still need to put another layer of waterproof underlay on top of that or would polyethylene plastic sheet over that glued on underlay be enough would you reckon? The laminate floor we bought is from Quickstep.

    Many thanks in advance!

  9. Hi there, AJ! Thanks for your question. It sounds like your laminate flooring has attached padding, meaning there is no need for an additional underlayment. We would suggest laying the laminate flooring as is, the 2mm padding will provide you with sound reduction and likely a moisture barrier depending on the type of padding!

  10. Hello,
    Not sure if this blog is still open. Thank you for the valuable information!! I hope you can answer my question. We are laying laminate on an old white oak wood flooring (I know… I should be restoring it but it is very expensive for me currently). We have 12mm laminate (10mm + 2 mm padding). After leading the above post, I am conflicted on laying underlayment. I do want sound reduction and moisture barrier. I was planning on laying the Floor muffler 2mm underlayment (mentioned above) but I am confused whether it will be detrimental to the stability of my laminate floor after installation. Could you please address this issue?

  11. Hi Joe! Underlayment is dependent on the type of flooring that you are installing. If you are installing a laminate floor, the best recommendation for warm would be felt underlayment. Felt Underlayment This underlayment will be 3mm thick and because of the construction it should be able to keep the floors relatively warmer.

  12. Hello, I have 8mm laminate and I bought from Bestlaminate the thin foam underlayment for my cabin in Big Bear Ca which has wood flooring. I used it for the upstairs which is the living room and kitchen, its a reverse floor plan. I am now gonna do the bottom which is the bedrooms, there will be tile in hallway and bathroom but it gets cold on the floor and we want the flooring to keep warm. We bought automatic vents so they would close to help with that in winter for our crawl space. What would be best for on top of wood to keep us warm… we do have heaters in room but floor still will probably be cold. I also wanted to know if we could use a thicker underlayment like 1/4″” or so? I thought it would help where our laminate will meet the hallway tile. I know I could use a step up or down threshold but thought it would also help with keeping it warm. Thanks for your time

  13. Hi Ven. We always recommend asking the manufacturer of the floor that you are installing what underlayment is able to be used. Floor Muffler may have a few options for underlayment for this case but always make sure that it will not void your warranty.

  14. Hi, I have a parquet floor glued to concrete, except for the solarium which has ceramic tile, an area roughly 9 ft x 15 ft. I want to remove the ceramic floor and extend the parquet into the solarium to make it one space.
    My condo building is about 35/40 years old located in Toronto. My condo corp has a rule that any floors being replaced must have underlayment meeting IIC 60 or better.
    Is there an underlayment thin enough so that it will not create an obvious bump in the floor where the solarium was?
    The parquet pattern is an old one, 5 vertical strips capped by 1 horizontal strip.

  15. Hi Amit. The underlayment will help with the noise reduction but if the subfloor is unlevel you will have sound and likely stability issues in the future. If the subfloor is unlevel the floor will creak and click. This will eventually cause the instability in the floor and put stress on the locking systems. We always recommend starting with a clean and leveled subfloor. If the LVT doesn’t have an attached pad, use a underlayment that is made for vinyl flooring and always install per the manufacturer’s instructions.

  16. Hi, Thank you for articulating such a thorough guide on laminate flooring.
    I have a question which I dont seem to have the answer to yet.
    If the sub floor is not leveled and I install a noise reduction underlayment, would that underlayment help to level the base for the laminate flooring. Or would I need to use a leveling compound for that?
    Also would these noise reducing underlayment help reduce squeaky noises on the existing floor, once replaced.

  17. Hi Verna, When picking a rug, you want to make sure that the backing or an additional rug pad is not rubber or latex because that will cause it to discolor. As long as the rug backing or pad allows the rug to breathe, you should be fine.

  18. I have a question: I purchased a mat-rug for laminate flooring, it has 100% polyester and polyurethane foam on the back, can I put this mat-rug on the laminate flooring? Please Help!

  19. Hi Cedar! Thank you! We are happy to help!

  20. I read your article on laminate flooring and found it to be really helpful. I especially liked the section about underlayment because that’s an area where many people get confused. You’re a wealth of knowledge!

  21. Hi Landon! You should be able to use a rag with acetone (or nail polish remover) on the areas that have glue without damaging the laminate.

  22. I just had floating laminated flooring put in. It looks like there is some gluefrom the pads on the floor. How can I remove the glue without damaging the floor?

  23. Hi Tom! The first thing we recommend is to make sure your subfloor is complete even, free of divots, pitching or bumps. If your current subfloor has a lot of issues to it, you may need to replace the subfloor or use a leveling agent to smooth it out. Due to the use of a wheelchair, we recommend using a click lock floor with a glue down installation. By gluing the material down to the even subfloor, this will prevent planks from shifting and potentially “popping” up from the weight of the wheelchair.

  24. Hi. I am installing a 7 mm laminate floor over an existing vinyl floor. My contractor installed it and there were a lot of obvious spots on the floor where it was uneven, slightly pitched, firm spots, soft spots. I had him take it up and the vinyl is noticeably unlevel. The vinyl is on top of a couple of other layers of osb and possibly ply wood. We don’t want to take up the entire floor and possibly have to put down a whole new sub floor. Would maybe putting down a thicker, higher quality underlayment help, or even possibly particle board and then underlayment? The floor is going to be used by someone in a wheelchair fyi.

  25. Hi Collette! We always recommend putting down a vapor barrier down with any floating vinyl plank or tile. There are also styles of underlayment that have a pad and vapor barrier combined together. Check out our Vinyl Underlayment Options

  26. Hi, I am working with a concrete slab at ground level. It’s perfectly dry (taped plastic down and left it for over a year, and no moisture at all). I want to install flexible vinyl “planks” and am confused about what to put under them. Would appreciate any advice. Thanks!

  27. Hi Xiaoxin! Yes, you would be able to use cork underlayment for laminate flooring. The underlayment does not need to be glued and can be laid right over the subfloor. Using another underlayment would not be required.

  28. How about cork sheet? Could I use cork sheet as the underlayment for laminate floor? My main concern is the heat insulation rather the noice. If cork sheet could be used as underlayment, should it be glued onto cemant slab or just lay on it? If I use cork sheet a
    is any other underlayment should be used?

  29. Hi Nikos, thanks for the question. Yes, you will need to find an LVT specific underlayment. Laminate underlayment may be too thick for the flooring you’re installing.

  30. Hello,
    i have laminate flooring and i want to switch to pvc. Do i have to change the underlayment (3mm) as well?

  31. Hi Dave, thanks for the question. In this case, the easiest option is probably laying an OSB or plywood over the area you need to build up. Adding 1/2″ cushion will be too much cushion for under the joints. Usual vinyl underlayment is 1.5mm or less.

  32. Hi, I have a 4th floor condo with a concrete floor. There is a single large room that has the kitchen dining and living area. The kitchen and part of the living area are tiled and the rest is carpet. I would like to do the whole space in LVP over the existing tile with no transitions. However, I will have to remove the carpet and build up the carpeted area buy about 1/2″ to be even with the existing tile. What is a suitable subfloor. I thought about a cement type backer board but it would have to be bonded to the concrete somehow. I think a high density rolled product might be better as it would just lay and conform to any small inconsistencies in the slab. It would have to be about 1/2″. Any ideas? Thanks

  33. Hello,
    I live in Upstate NY. My house is one year old and I am finishing the basement. We think we want to do luxury vinyl planks. The basement is dry but really just want an underlayment to add a little insulation (warmth) and a thin vapor barrier. What product do you recommend?

  34. Hi Scott, thanks for the question. The vapor barrier will help to keep the slab drier. You will be fine adding the vapor barrier film. You can check out our highly rated Visqueen vapor barrier:

  35. Hi Rob, thanks for your question. It depends on the underlayment, but I believe they will last a very long time. I would call the manufacturer of the underlayment you choose to see if they may have an estimated lifespan for you.

  36. Hi, this is great information. I am considering a basement finish and do have verified moisture coming through my slab (6lbs/1000sqft/24hours, up to 95%RH). My concern with putting down one of these vapor barrier products is the possibility of mold forming underneath (between the barrier and the below grade slab).

    Am I over thinking this, or will I be ok with just putting one of these down, sealing it at the edges and installing a LVP floor?

    I’m in the Northeast, climate zone 5. Worried a little about condensation in the summer as well.

    I was about to purchase an expensive commercial vapor barrier (Kovara MBX), but wondering if these simple solutions will work just as well. Do you know the perm ratings on your products? Would they do anything for soil gasses (like Radon)?

  37. Hi- I am looking at installing engineered hardwood with a thick wear layer that can be sanded several times. This means the floor could potentially last for 50+ years. However, I don’t see any underlay lifetime comparison data which is obviously important for a long life floor. What do you recommend?

  38. Hi Kelly, great questions. First, what type of vinyl is under your flooring? If it is glue down vinyl planks or sheet vinyl, you can install over it. Be sure that it is in good shape and level. If it is floating vinyl, you will have to remove it and install over the subfloor. Second, no, a sound dampening underlayment will not void a laminate warranty. You will need to use an underlayment with laminate, so just shop for one with added sound dampening! You can take a look at these underlayments that meet your requirements:; and

  39. Hi! Two questions:
    1. Can I install laminate flooring, click together, over existing vinyl or must I remove the vinyl and install on the wood subfloor?

    2. My condo association requires sound dampening underlayment but I see comments on other sites about how using that for click together laminate will void the warranty. Is that true? Why? If so, what can I do to fulfill the sound dampening requirements? The STC and IIChave to be at least 60 for each.

    Thank you for your time and expertise!

  40. Hi Jody, yes all of our underlayments can be used with radiant heat. To keep the air flow circulating and the heat moving through to the floors, we do have 2 underlayments that help with that. We have the Kronoswiss and Roberts. You can shop them here: and Feel free to give us a call at 800-520-0961 if you have more questions on your project!

  41. The current floor is very level. That’s good news to know about the laminate floor over tile in regards to grout lines.
    How do I make sure that I’m using an underlayment that will work with my under floor heating system. Is the Blue that you are recommending good for that? for instance the felt you are recommending has insulating properties and I thought that would work against my heating system.

  42. Hi Jody, thanks for the question. With a laminate, you probably won’t see the grout lines. The biggest issue with an un-level subfloor is that it can compromise joints and the laminate can sink, or feel hollow in places that are not level. For underlayment, you will want to use a vapor barrier if your concrete sweats. You can find a combination like our Blue or if you want extra features, like sound reduction, you can go with a felt or Floor Muffler.

  43. Hi, I am installing an 8mm laminate over a ceramic tile. I know I’m supposed to use a leveler over the grout lines but I really don’t want to do that. I understand that eventually, you might be able to see the grout lines. By then I will be retired and the next owner can deal with it. At least I won’t have messed up the tile if they want to take the wood laminate out.

    We are installing the laminate over the tile which is secured to a heated concrete floor. It’s heated with hot water that runs through tubing and is heated with a boiler. I am not worried too much about moisture except in the spring when the concrete is cold, sometimes it sweats, when the air changes and we haven’t run any heating for a period of time.

    My question is what would be the best underlayment to use? I feel like this is probably the most important step in my plan and I am totally confused. Thank you. Look forward to getting your answer.

  44. Whoops, error on our part! We’re only human 😉 Thanks for pointing that out. We have fixed it.

  45. So, who’s the genius who determined that OSB stands for ‘Oriented Standard Board’? It’s Oriented >>STRAND<< Board. I would think it would behoove a FLOORING WEBSITE to at least get common terms right!!

  46. Hi Perry, thanks for the question. I would not recommend putting the underlayment over the indoor/outdoor carpet. I am not familiar with the SnapStone product, so you may want to reach out to them directly to see what they would advise.

  47. Hello,
    I’m creating a four season room out of our patio. Presently we have a concrete floor covered with indoor/outdoor carpeting. Perfectly smooth. We are going to put porcelain SnapStone with Quietwarmth radiant heat underlayment. My question is,..
    “Can I use Quietwarmth Plus underlayment over the existing indoor/outdoor carpeting… then the heating system… followed by the porcelain SnapStone?” Or do I need to rip out the existing carpet? Btw.. as is right now, it’s perfectly smooth. What do you recommend?

  48. Hi Carolyn, thanks for the question. This will depend on what type of vinyl flooring you will be installing? If you’re going to install a rigid core or a thicker vinyl, you may be able to get away with an underlayment that will help smooth out the surface. If you’re looking to do a 4mm or less standard LVT, this will take on the unsmooth surface after time. For a standard LVT, I would recommend adding a plywood subfloor over the tiles or using the leveling agent. Depending on the amount of space, you can decide what will be the easiest for you. If you have anymore questions, let us know!

  49. Carolyn Mathas

    I am installing a vinyl plank floor in a kitchen. The issue is that there was carpeting down (yes, I know, gross) and when I removed the carpeting, there were linoleum tiles that were coming up with the adhesive that was used to put down the carpeting. These tiles were over another linoleum floor. That bottom floor has so much adhesive stuck to it now that you can’t even stand on it for long or you may never move off of it again–and the adhesive layer is making it tough, if not impossible, to get everything smooth. In addition, some of the top layer of tiles has come up easily, others are still there and not budging. This top layer of tiles is very thin, fortunately. So, the question is, what do I need to do? Do I have to put down an underlayment, a plywood subfloor, a leveling agent? If I can’t get it smooth enough, what would be best?

  50. Hi Michael, thanks for the question. For cork, we’d recommend still using a vapor barrier film, such as this: Cork will be a good option for R-Value. Just make sure the cork is specified as laminate underlayment to avoid any warranty voids. You may also want to check with the manufacturer what the limits on underlayment thickness are.

  51. Michael Blaney

    Hi, I want to install a 12mm laminate on the ground floor of my townhouse which has a suspended conc. slab over a crawl space. This slab gets very cold in the winter months as there is no insulation below. I would like to use 6mm thick cork sheeting as an underlayment to provide some insulation value – 6mm cork has an r-value of approx. 1.125.
    Is this a good choice for underlayment and would I still need a vapour barrier or is there anything better out there to use. I’m located in southern Ontario, Canada.

  52. Hi Pat & Frank, thanks for the question! I’d recommend this 3in1 underlayment that has a built in moisture barrier. It’s high quality and a great price:

  53. Pat and Frank Dowd

    What is the best solution for moisture barrier for a sunroom floor -wood as the base, not concrete?

  54. Hi Zachary, thanks for your question! Most laminate underlayments start at 2mm as a standard. A 2-3mm underlayment will be fine for you. You can only go too thick with thinner laminates, but with a 12mm, you will be fine! Let us know if you have any other questions. Be sure to check out our selection of underlayments as well:

  55. I’m looking to do 12mm laminate flooring throughout my upstairs and was wanting to put a sound reducing underlayment to (as the name implies) reduce the sound of foot traffic for the lower levels. Most the underlayment I’m seeing is 2mm or more putting my flooring a minimum of 14mm off the subfloor. What thickness would you recommend for the underlayment and is it possible to go to thick??

  56. Hi Laurie, I would 100% recommend using vinyl flooring as this would keep you clear of any moisture issues.

  57. Need Help!!! We hired a contractor and remodeled our walk-out basement nearly 3 years ago. They took up berber carpet and ceramic tile and glued down engineered hardwood (concrete slab in walk out basement). We did not build the home so we are unsure if a vapor barrier was put under the slab when the house was built. Within a few weeks, the planks started separating and there is sever bounce in the flooring. We are still dealing with the issue and are getting ready to have it ripped out and start over again. Someone suggested luxury vinyl planks. We have teens, two big dogs and the pool is off of this area. Should we consider laminate, luxury vinyl or something else and what about underlayment? Please help – we would really like this resolved so we can on with enjoying our home and our lives.

  58. Hi Bib, thanks for the question. You should never use double the underlayment. If you’re installing over a wood floor, you should not need any additional vapor barriers!

  59. Hi Lisa, thanks for the question. You will cause even more issues by gluing down the planks. We would not recommend this. We’d recommend looking into a glue-down vinyl floor in this case!

  60. We are going to take up the carpet in our living and installingl laminate flooring. The subfloor is wood and it’s above a concrete basement…The man where we bought the laminate said we needed a underlayment, but the flooring already has it.We put laminate in our hallway an 2 bedrooms about 9 years ago and never used extra underpayment. My uestion is do w need to use extra underpayment if the flooring already has it and do we need to use a vapor barrier since the subfloor is wood , but it’s above a concrete basement.

  61. Hi I have an old Mobil home with floors that are not even. I know that I should try to level floor first but it I don’t can I glued the pergo plants directly to the sub floor to try and prevent seams from separating or buckling. I know planks were intended to floor but can I glue them down anyway. Thank you.

  62. Hey Jay, typically if a floor already has a pad attached, you can’t put another layer of padding down. This will cause too much flezing and cause the floor to buckle. I would definitely recommend checking with the manufacturer though!

  63. I’m considering a laminate that already has the underlayment attached, and I will need a vapor barrier (concrete slab). Is there a vapor barrier that provides some additional thermal insulation that can be used in this case?

  64. Hey Shelly thank you so much for reaching out. Laminate floor needs a foam pad to go over due to needing a softer material to help it expand & contract. So therefore yes you would need an undrlayment in this situation. Please let us know if you need any other assistance.

  65. Can laminate be installed over cork flooring and if so would I still need an underlayment? If not could I use one anyway for added comfort? I have neuropathy which makes it hard to stay on my feet for long but I love to cook. If this would work, which underlayment would be best? I would be doing all of the house except bathrooms. I can’t do cork alone due to teenagers and pets.

  66. Hey Paul, thanks for the question. Unfortunately there is not really another option to find the IIC/STC other than contacting the manufacturer or the flooring. You should be able to find general studies/testing done on cork though, not specific to the floor.

  67. Question…I’m looking at a NuCore Vinyl Plank from Floor and Décor for a floating installation in a 12th floor condo. The HOA requires sound proofing underlayment. The NuCore floor has an attached cork based underlayment but they offer no STC/IIC rating info that I can use to satisfy my HOA. Any suggestions? Thanks much. Very impressed with your site.

  68. Thanks! Making my purchase now.

  69. Hello Ash, thank you so much for reaching out to us! The Roberts Super Felt has a vapor barrier attached already (the greenish side that is uniform is the vapor barrier). This product is $35.99/100 sf, so you would be looking at a total of $359.90. All orders leave within three business days with a transit time of two days to Virginia via FedEx. Please feel free to contact us if you have any other questions.

  70. Dear Sir or Madam,

    I am interested in buying the Roberts 70-190 Super Felt. I have the below questions:

    1. If I am installing this under the laminate in the lower-level on concrete, do I need a vapor barrier also along with this underlayment?
    2. What is the cost of this underlayment for 1000 sq feet.
    3. How quickly will you be able to ship it if I order it today? My zip code is 22033

    Thank you,

  71. Hi Betty, thanks for reaching out. On a wood subfloor, we recommend Super Felt Premium Felt Underlayment, which will provide a vapor barrier, insulation, and sound reducing properties. You can learn more here:

  72. We are installing laminate flooring in 2 bedrooms on wood subflooring. I want as quiet and as warm underlayment as possible. Which would be best – felt or the thin foam?

  73. Hi Eric, thanks for reaching out. Here are three of our best options for laminate flooring installation. Please let us know if you have any other questions!
    1. Floor Muffler Ultraseal Silent Flooring Underlayment – IIC Rating 74
    2. Floor Muffler LVT Ultraseal Flooring Underlayment – IIC Rating 71
    3. Silver Vapor 3-in-1 Flooring Underlayment – IIC Rating 64

  74. HI, 3 story townhouse on plywood sub-flooring. Don’t believe I need vapor lock but would like to keep the noise level down from the 3rd and 2nd floor. Can you please recommend your top 3 options? Let me know so I can make the purchase today. Thanks in advance!

  75. Hi Angel, thanks for your comment. Laminate flooring is a floating floor, and it floats on top of the underlayment you have installed. Depending on the flooring and thickness, it is possible for laminate to have a slight give, when compared to flooring such as hardwood or tile that is permanently secured to the subfloor. We hope this helps!

  76. My floor has a slight give to it when it’s walked on. There is a vapor barrier under it and it was installed in my basement over concrete. Thanks!

  77. Hi Samuel, great question! I would recommend the floor muffler underlayment or the felt. You can find them here: and Both have a vapor barrier and great sound reduction.

  78. We are doing our bedrooms in Kronoswiss Laminate. It will be laid over a concrete slab . What would be the BEST underlayment for sound reduction?

  79. Hi Denise, thanks for your question! You should put the luan down before the felt. Your subfloor will need to be sturdy and in good condition before starting your installation. You will put the underlayment on top of the subfloor and the laminate directly over it. Be sure to get a copy of the manufacturer instructions to follow!

  80. I will be laying laminate flooring in my living room. It will be placed on plywood subfloor. I have the Super felt premium for underlayment. My question is should I put Luan down first before the felt? I cannot find an answer anywhere on this? I have been told both. Thank you

  81. Hi Christina, thanks for your question! In this case, you should be fine. Regardless, it will keep any moisture out, whether the barrier is on the bottom or top. If it is going over linoleum, I’m thinking your moisture potential is very low, so the fact the foam is towards the subfloor should be fine. If it was going directly on concrete, I may re-install it with the moisture barrier down. Hope this helps!

  82. This website is excellent and I have learned so much! I have learned the people currently installing my laminate floor, have laid the underlayment upside down. It is similar to the Silver 3in1. So the silver side is up and the moisture barrier film is down. But it is being installed over linoleum. Should they stop and fix the underlayment or continue? The area in which they are working on is the kitchen, hallway, and living room.

  83. Thanks for your feedback Don! We appreciate you checking out the article.

  84. I sell flooring and a lot of the Vinyl and Laminate Flooring I push already has a backing on it but it doesn’t have nearly the cushion that some of the others but I’M SUPER GLAD I read about doubling up on underlayment as it could weaken the joint holding the flooring together. Makes a lot of sense but I also get on maybe why something without a cushion should be used under a pre-backed floor might still need to go over a vapor barrier when it’s over concrete.

    Radiant floor heat and concrete are ALWAYS my concern with any flooring and so I feel this article is absolutely awesome. I’m supposed to remain objective selling flooring but I sure enjoy Vinyl over Laminate in spite of the quality of the Pergo X-P and other top of the line floorings

  85. Great to hear Ron! Happy to help 🙂

  86. Excellent. Thank you, Alana. That actually worked out better than the smaller bedrooms I did “all at one time”. Appreciate your advice!

  87. Hi Erika, thanks for your question! I am sorry to hear about your moving situation. To remove mold on concrete, you need to scrub the mold off with bleach. Waiting for the concrete subfloor to dry will be the longest part. You will need to wait until the concrete no longer is holding any of the moisture, hopefully within 1 to 2 weeks the moisture reading will be acceptable – 4.5% vapor emission rate or less. After that, it should only take 1-3 days to acclimate and install the laminate if skilled workers are hired to lay it in one day. Hope this helps!

  88. Hello,
    I recently rented a condo in Houston TX. Move in date was pending due to the installation of new laminate flooring being installed on the first floor. There is 2yr old laminate in the entire condo but the first floor was originally incorrectly installed without the use of vapor barrier over the concrete subfloor. The laminate was just glued straight to the concrete. All the planks are warped and pulling up. This is a warranty issue and the owner of the condo has been working with the store to remedy the situation. The flooring was delivered on Saturday. Today the installer came and told the owner there is mold under the old floor. Needless to say, the owner is quite upset and called to tell me move in will be delayed…(was to move on July 1st). My question is what is the process to remove the mold, reinstall the floor and how long should I expect this to take? As of 7/1, I will be homeless! Any insight is appreciated! Thank you!

  89. Hi Ron, thanks for the question! It does not make a difference. All of our underlayments can be laid the same direction of the flooring. And yes, we recommend working lay as you go. Unroll one strip of the underlayment, add flooring, repeat. Just be sure to read the manufacturer directions before getting started and follow those. Hope this helps!

  90. I had heard The laminate should be installed perpendicular to the underlayment. Is there any truth to this or does it not make a difference? We have a house full of (too much) furniture and gutting the living room to completely cover the floor with underlayment before laying the laminate will be nearly impossible. Is it okay to lay underlayment and laminate in the same direction in sort of a “lay as you go” scenario?

  91. Hi Lisa! I am so sorry to hear about the issues you’re having. Luckily, laminate can be uninstalled and re-installed! We have a wide array of flooring underlayments. Here are the best for additional cushion that have a vapor barrier for your concrete subfloor:, and

    Feel free to read the product reviews and decide what you think!

  92. Me, again.
    This is for the ground floor of a single-family home, if that matters.
    If felt is the best for shock-absorbing comfort, is it practical for use in warm, humid South Florida?
    Thank you!

  93. Help! We just had an 8mm Mohawk “Carrolton” laminate installed over a concrete subfloor using a 2mm rubber underlayment. It now has such a “hard” feel when walking on it that it hurts my feet (ankles, legs, and sometimes even hips) when I walk or stand on it. It’s very painful. Actually feels harder than walking on the bathroom tile floor or even directly on the concrete garage floor! I try to avoid walking on the new floor as much as I can – not easy, since it’s the kitchen, family room, and entry hallway. I can’t imagine spending the next 20 years doing this (and probably ruining my joints in doing so).

    PLEASE tell me – what is the best underlayment for shock-absorbing comfort (for the 8mm Mohawk Carrolton laminate being installed over a concrete subfloor)? That 2mm rubber underlayment is the only one the flooring company uses, but I know there are other choices out there.

    Also, we live in warm, humid South Florida, if that factors into the decision.

    This whole situation just amazes me, because the 12-year-old Mohawk “Country Cottage” laminate that we are now replacing (only due to water damage) is perfectly comfortable underfoot. It has some attached backing/underlayment and a separate (3mm?) underlayment laid down on the concrete.


  94. Hi Jim, thanks for your question. Yes, you will still need to use an underlayment. We offer a standard cushion that would work well for this application. You can find it here:

  95. Do I need to use underlay if I am going to install laminate over existing vinyl sheet flooring, there is no need for moisture or noise reduction in this installation.

  96. Yes, roofing felt should be fine too!

  97. Or better yet maybe roofing felt?

  98. Hi Mike, thanks for your comment. That is a good idea, you can go ahead and install a vapor barrier such as Visqueen beneath your laminate, this will prevent the tackiness from getting on your laminate, and provide additional moisture protection for you. Please let us know if you have any other questions!

  99. I am installing a laminate floor with the pad attached. The subfloor is plywood. Normally I would place it right on the plywood. However, the floor was previously carpeted and glued down. The glue remnants are very level but still slightly tacky. I need to separate the tackiness. Can I use 6 mil poly over the tacky plywood and then place the laminate on top of that? I know this is an acceptable method for laminate over concrete as a vapor barrier. I am just wondering over plywood if the poly sheeting would cause a moisture problem.

  100. Hi John, thanks for your comment. Although cork underlayment was not discussed in this blog post, it is an excellent and popular option for laminate flooring that will provide sound dampening qualities like you mentioned. We currently do not carry any cork underlayment, however we can definitely assist you in finding the right underlayment with sound dampening features for your project. You can check out our underlayment options here:

  101. Hello –

    I don’t see anything about cork as an underlay? I know the cork wont provide much softness or bounce but I am wondering why it isnt listed as I would think cork would provide excellent sound dampening, hopefully reducing some of the hollow noise laminate tends to leave.

  102. Hi Karoline! Thanks for your question. You should not need a vapor barrier in this circumstance, as the tile and wood will not be emitting moisture. You will want to level your tile and wood floors before you lay a laminate. If you’re looking for a more premium underlyament for your project that includes sound dampening and more cushion, we’d recommend going with a non-attached underlayment floor and buy a higher quality underlayment.

  103. Hi,
    Wonder about underpayment…?
    I know it is not recommend to add another padding if the laminate have one pre-attached.. however is my concern..

    Installing the laminate over tile …. dining room and old wood in the living room. looking for leveling… with joints, sound reducing and confort… more cushion…

    Do I need a vapor barrier? It is not in the basement…

    Always used 3-1 Robertson underlayment before..

    Don’t want to overkill but looking for confort.


  104. Hi Larry, thank you for your comment! Laminate flooring is a great option for a home with children – it is scratch, stain, slip, static and moisture resistant.

  105. Thanks for mentioning that underlayment is essential because it allows a floor to float. I have multiple children, and I would like to have my floors be kid-friendly. Floors that float through the use of an underlay sounds like a great option when having kids in the home, so that will be something I’ll look into more.

  106. Hi Alice, unfortunately, we do not ship to Europe. We only ship to the contiguous 48 United States.

  107. Hello Ashley, thanks for your quick response and your help was valuable. I have been looking all over the place for bestlaminate 3in1 felt underlayment to buy direct online in EU, UK or Ireland but it does not exist. You seem to be the only one who has it. Have you a shop in Europe, or UK? I live in Ireland. Do you ship to Ireland? Thanks

  108. Hi Alice – thank you for your question! You will have to make sure your subfloor is even before you can lay any underlayment or new flooring. No underlayment will fix major subfloor imperfections like you mentioned. Once you have an even subfloor, we would highly recommend our Bestlaminate 3-in-1 Felt Flooring Underlayment. It’s 4mm thick and the felt is perfect for retaining warmth in rooms. It comes with an added vapor barrier which will keep out the moisture and it comes with an overlap and adhesive strip for easy installation. Feel free to give us a call 800-520-0961 or order online!

  109. We bought a 60’s house last year and we’re renovating it. We had OSB laid on floor joists, in some places the joints between OSB boards are uneven by 2-3mm, there’s lippage, and the OSB boards don’t go up to the wall, the installers left a 1-2cm perimeter gap along the edges. I don’t know if this is good or bad. Underneath this floor is a large void, our foundation doesn’t have a DPC or insulation except in the walls. We live in a cold, wet climate and have moisture problems. We plan on putting pergo laminate. What is the best underlay for this situation? We need to put something that prevents damp, insulates, fixes uneven levels between osb boards (2-3mm) and good sound insulation. Is there a 4 in 1 underlay for this or can i put DPC first and then a 3 in 1 or something like that? Thank you.

  110. Hi Drew – If I am not mistaken by the information you are giving me, you are creating a wood subfloor on top of a concrete subfloor. Yes, the particle board can be affected, because it doesn’t sound like you installed a vapor barrier underneath the 30mm foam insulation. Your laminate flooring will be protected, but your subfloor will not.

  111. hello
    I am putting 30mm of extruded foam insulation then particle board then a thin plastic sheet then cork and laminate flooring. I was wondering if the particle board will be affected after 30mm of insulation it was not taped.

  112. Hi Val, thanks for your question. You should never use two layers of underlayment, as it can compromise the joint integrity of your flooring. The floor muffler will provide excellent sound and cushion on its’ own. Let us know if you have any other questions!

  113. Can I stack 2 pieces of floor muffler?

  114. Hi Marilea – You cannot use carpet padding under your laminate flooring. You have to use laminate flooring underlayment under your laminate flooring. Laminate flooring underlayment is at most 4mm thick. Laminate flooring underlayment cannot be too thick or it will compromise the joint integrity and be too bouncy – causing the joints to fail and your floor’s locking system to break.

    Unfortunately, the only two options are to either:

    1) Use a reducer molding in the doorway to connect the old floor in the hallway to the new floors in the bedrooms
    2) Remove the old floor in the hallway, make sure the subfloor is level, and install all new flooring

    Even if you were to use thicker padding, the locking systems of the two different floors will probably not lock together, so you would still have to use a transition molding to connect the gaps between the floors. I hope this helps you. I’m sorry that there isn’t a better solution.

  115. i have a laminate flooring in the hall way that is 14.3 MM thick. I am not to fond of that flooring and would like to put a different flooring in the bedrooms that is 7 MM thick. It has no barrier or padding on it like the other one. I want them to be even and I dont want annoying transition pieces in the door way. I figure I will need to get a padding or vapor barrier 3 in 1 that is 0.25 inches or 6 MM thick. What do you recommend? When we took out the carpet i compared the thickness of the padding under the carpet and it was just about the right thickness that I would need to get the right height. I contemplated using an underlayment and then using a carpet padding. I cant seem to find an underlayment that has enough padding to meet the requirement of the height of the already existing laminate flooring in the hallway.

  116. Hi John, thanks for the question! It will depend on what your goals are with an underlayment. Are you looking for sound reduction? Thermal insulation? Lighter on the foot? A floor with attached underlayment usually comes with a standard foam padding. If you want added cushion and more features, we would recommend going with a better grade underlayment. You can check out all of our underlayment options here: Let us know if you have any additional questions!

  117. i plan to buy pergo laminate planks and install it over a 12 inch tiles floor, which is pretty level…my question is, what thickness is the pergo underlayment and would i be better suited to buy the flooring without underlayment and buy a better grade of underlayment…i will be buying 10 or 12 mm flooring, AC4…any help would be greatly appreciated
    thank you,
    john ferguson

  118. Hi Buck – thanks for your question! With any laminate floor, you will need to have an underlayment. We’d recommend going with a 2-in-1 vapor barrier padding if you have seen moisture issues. From what I see, it looks like your Pergo Gold Underlayment should do the trick! Good luck with your installation.

  119. Robert Buckingham

    We are replacing dining room carpet with Pergo Max. I have also purchased Pergo gold underlayment. The floor is particle board and had some mold issues. Carpet padding had stuck to fool as well. We have removed all carpet, scrapped up all padding, scrubbed with vinegar and water then applied a coat of Zinsser sealer. Can we just put the Pergo Gold over this or should I add a 5 mm plywood type underlayment to get a smoother surface? I do not want to ever have to redo this flooring again!


  120. Hi Matt, glad you enjoyed the article! If you’re installing laminate, you will need to have some type of foam underlayment if it isn’t already attached. In this case, you will probably be fine with a standard pad since it is over particleboard, but to be sure, you may want to install an underlayment with vapor barrier for a few extra cents. Here are two great options: or Hope this helps!

  121. hello,

    thanks for the great write-up. I’m re-doing a den that is at grade on top of concrete. I want to install pergo laminate flooring like in the kitchen (above grade and seems to be holding up well) in the den. The den previously had carpet and the subfloor is a painted particle board. Never had any moisture issues with the carpet and no sign of water/mold under the particle board that was resting on the concrete.

    what do you recommend? vapor barrier still? Or really just my preference what goes on top of the particle board?

    Thanks much

  122. Hi Ligia! If I am correct, the Coretec Plus product comes with an attached cork underlayment. You will not need any additional underlayment, and can install right over the concrete subfloor!

  123. Hi Laurie! We did not, you can find the Visqueen Vapor Barrier here: Let me know if you need help finding anything else!

  124. Hi Mike! Great question. We still recommend using an underlayment with the radiant heating system. You want to look for an underlayment with a lower R rating, so that the heat can easily move through the underlayment. We’d recommend the Floor Muffler for this case. Hope this helps!

  125. Hello! I will be installing Coretec Plus XL over concrete in my basement. Which is the best underlayment for this?
    Thank you!

  126. Did you quit selling the Visqueen?

  127. I am installing a thermo-soft heated mat system in my 12 x 12 ft. den, the laminate I purchased is Shaw Nature Element with no padding attached do I need a product like Robert’s First Step or would that be too much insulation between the heated mat and the laminate flooring.
    Thank you

  128. You are welcome! Good luck on your project – don’t hesitate to reach out if you have any additional questions!

  129. Thank you Alana for your quick response. You have been most helpful.

  130. Hi Marianne! Thank you for your question. Relcaime Malted Tawny Oak is our best seller in the Reclaime collection. The flooring tone will definitely be a timeless option and match many decor styles. We have two beautiful home tours that feature this flooring. I’d recommend checking these out to see how beautiful the flooring really is: ;

  131. We are seriously considering laying Quick-Step Reclaime Malted Tawny Oak laminate in our home.
    Is this color/stain/collection flooring considered timeless from year to year, era to era as we do not
    want flooring that is a trend and will eventually go out of style. This question is probably best answered
    by a color expert and/or design expert. Thank you for any assistance you can give.

  132. Hi Robert, you are welcome! I’m glad we could help. Yes, you can order samples of the underlayment. All you will need to do is fill out this form ( with the underlayments you would like to see. Additionally to Floor Muffler, the Kronoswiss Provent is another great option for a radiant heat system. Once you submit the form, we will get the samples out to you right away.

  133. Hi Jim, thanks for your question! One problem in the previous installation is that the vapor barrier should have been installed under the felt underlayment. One of our best underlayments for both sound and moisture is the Floor Muffler ( You may also look into the Kronoswiss ProVent which has a humidity and moisture barrier ( You shouldn’t need the vapor barrier film ( along with these two options, but you can also put it down for added protection and peace of mind. Hope this helps! Let us know if you have additional questions.

  134. Hello Alana. Thank you again for your prompt and informative replies. I am giving serious consideration to the 700 sf roll of the Muffler Underlayment, however I would like to know if a sample is available? I did read that samples of laminate are provided, however I didn’t note a request for underlayment.

    Thank you.

  135. I pulled up a laminate floor installed by previous owner a few weeks ago that had a felt with vapor barrier underlayment on concrete subfloor. Discovered there was mold under it. So I now want to put the flooring back down with a new and hopefully better underlayment more suitable for Florida humidity. The vapor barrier was on top so the felt got damp from the concrete sweating and developed mold. What would you recommend for an underlayment. PS – I have moisture treated the floor and also applied concrete waterproofing in attempts to slow the moisture down as you would do for a garage floor.

  136. Hi Robert – that is a great question! The reason they recommend this is just for ease of installation and helping to keep the underlayment flat. You can definitely lay the entire floor muffler down, as it tapes together at the seams. Hope that answers your question!

  137. Thank you for suggesting the Floor Muffler underlayment. As previously stated, I need to install an underlayment over slab concrete as the first step, followed by the Thermosoft Heating mats and then the Pergo Laminate. Your instructions forlaying the Floor Muffler says to lay a roll, then lay the laminate, lay another roll, then lay the laminate and so on. I was planning/hoping to lay the underlayment over the entire floor, then lay the heating mats, then the laminate. I cannot lay the heating mats one mat at a time. I need to lay the entire floor area. Can I still use the Floor Muffler?

  138. Hi Robert, thanks for your question! We would recommend using the Floor Muffler Ultraseal Underlayment. It is suitable for radiant heat and has a built in vapor barrier for over concrete subfloors. The R-rating describes the insulating properties, so the underlayment will help keep the heat from disbursing. The floor muffler is a good choice. Here are the details for the product: Let us know if you have any additional questions! Always be sure to check the manufacturer of both the floor and radiant heat system to make sure all of the materials are appropriate for installation.

  139. I am looking to install the Thermosoft radiant heating mats under 625 SF of Pergo laminate floor. I am in a high-rise condo with concrete slab flooring, so “downstairs” noise is not an issue. Thermosoft installation requires:

    1. underlayment (over concrete slab)
    2. Thermosoft heating pads
    3. moisture barrier
    4. Laminate flooring

    What type of underlayment do you suggest? What “R Value” would work best considering the heating element goes over the underlayment?

    thank you.

  140. Hi Dave! Thanks for your question. With vinyl flooring, you do not need to use an underlayment. The material is thinner, so adding additional cushion can cause instability with the locking systems. If you are worried about moisture, you could use this vapor barrier film: Be sure to read the manufacturer instructions for any underlayment specifications. Let us know if you have any additional questions!

  141. Is there a difference in underlayment materials used for laminate floors, and those used with vinyl plank flooring? Or, can a single typ of underlayment be used under both types of flooring?

    Thank you

  142. Hi Danielle! Thanks for your question. With a wood subfloor and raised home, we would recommend going with the Floor Muffler underlayment that has a strong vapor barrier: You can also opt to add double protection with laying a vapor barrier film first, and then installing the underlayment. Here is a link to the film: By doing this, you should have no problems with vapor! Let us know if you have any additional questions.

  143. What type of underlayment is recommended for all wood subfloor. We also live in a raised house. We had issues with the floor buckling due to moisture from using Premium Underlayment with 2mm polyethylene foam laminated with a vapor barrier. We may have to cut old wood floor and make subfloor dry plywood.

  144. Hi David! Thanks for your question. Whenever buying a laminate with attached padding, it is not recommended to add additional underlayment to the subfloor. If it was being installed over a concrete subfloor, then we would recommend just a vapor barrier film. Adding too much custion under your flooring can effect the flooring stability and proper installation. Check out this article on the topic:

    I do not know about the exact products you purchased, as we do not carry those, so I cannot give you 100% accurate advice. Be sure to read the manufacturer directions first! Adding additional underlayment can void warranties if the flooring was not installed correctly. Hope this helped!

  145. Hi, i am having the same issues. We bought 12MM + 3MM padding Kingsington Manor laminate flooring from Lumber Liquidator. The salesman stated that we needed to buy the Bella premium underlayment for best results, sound proofing and heating and cooling bills. I am laying it in our main level of our house above the basement and it will be on plywood subfloors. It has carpet on it now but that is going to be removed and so is the carpet padding.
    Do I need to put down the Bella premium underlayment or not? It is ok and helpful to do so?

  146. The thing you have to be careful with is creating too much flex underneath your laminate flooring. If you put too much padding, the floor won’t be stable and it could become damaged and void your warranty. First, I would check your floor’s manufacturer warranty and see if there are any recommendations. But, Cork or our Floor Muffler could work because it’s more rigid than a felt underlayment and it’s thinner so you won’t have to worry about under-cutting doors. I hope this helps you!

  147. Cork under pre-padded laminate possibly?

  148. If it does have the attached underlayment are there any other options I can use to address the potential sound issues?

  149. Hi Craig! Great question! No, you would not use any underlayment if your laminate flooring has pre-attached underlayment. Adding unnecessary cushioning can actually be harmful to your floor. However, if you are installing over a cement sub-floor, you should lay down a vapor barrier, such as our 6mil Visqeen PE vapor block PE film, which does not have any extra padding. If you have any other questions, please don’t hesitate to ask!

  150. In the introduction of your discussion on underlayments you make the statement “Perhaps your laminate flooring has underlayment pre-attached- what then? ” but it is never addressed. Is it okay to use a felt Roberts underlayment if the laminate already has an attached underlayment?

  151. Hi Jon!

    The Visqueen is used to add a layer of moisture protection when installing on concrete. Most sound dampening underlayments come with a preattached layer of film for moisture protection. As long as there is a film made for moisture protection, the thickness does not make a difference. Roberts Silent 3 in 1 ( underlayment is the best option because it provides sound reduction, moisture resistance and corrects minor subfloor imperfections.

    If you already have an underlayment that does not have a moisture protection film, it is okay to install Visqueen underneath. Be sure everything is flat and well secured together.

    I hope this answers your question. For additional info, feel free to call 1-800-520-0961.

    Have a great day!

  152. Can I use the 6mm visqueen under a sound dampening underlayment? Is it necessary? The visqueen coming in at 6mm, as opposed the the other products offering only 2-3mm of moisture protection concerns me a bit. I’m installing a 12mm laminate flooring with a concrete slab.


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