Aquabar B Moisture Vapor Barrier Underlayment Installation

Under wood floors, Aquabar B serves as a moisture and vapor retarder, reducing or preventing moisture migration from below the floor system, allowing the wood flooring to acclimate gradually. As a semi-permeable material, Aquabar B is also much less likely than poly film to trap moisture condensation between it and the sub-floor. Installed under wood floors as a “slip sheet,” Aquabar B helps keep down dust and reduces squeaks.

Gather Your Supplies

Gathering your supplies and tools needed for your installation will help you get the job done faster and smoother! Here are the basics needed for the Aquabar B underlayment:

  • Aquabar B Underlayment
  • Utility knife
  • Tape
  • Broom or ShopVac

Begin Installation

Step 1: Fix, clean and prepare your subfloor

Repair any damages, level the surface and clean your sub-floor. Follow our guidelines to prepare it properly.

Step 2: Read Instructions

Always read and follow the floor manufacturer’s installation instructions.

Step 3: Check Sub-Floor

Concrete or wood sub-floor must be dry and tested for moisture, flat, structurally sound, and free of protrusions and contaminants.

Step 4: Clean Sub-Floor

Sweep sub-floors clean of debris to avoid punctures and tears

Step 5: Cut

Cut Aquabar B to length as required for proper coverage and overlap all seams a minimum of 4 inches.

Step 6: Lay

Aquabar B may be loose laid or stapled over subfloors. Avoid puncturing Aquabar B except with required fasteners.

Need help selecting the right underlayment for your flooring project? Contact one of our flooring experts to guide you through the types.