How Do I Make The Joints More Water Proof?

Good quality laminate glue and silicone caulk can help seal your laminate to help make it more resistant to moisture. Always use a PVA Type II Glue when gluing laminate flooring planks. Some wood glues have too much moisture in them. Choose one in a bottle so you can regulate the amount of glue that comes out; you'll need very little glue to complete the job. Silicone caulk in the expansion gaps will prevent any moisture from leaking underneath the planks, while still allowing the floor to float properly.