What is underlayment foam? Is it needed?
A. Underlayment foam serves many purposes: It provides greater thermal and comfort insulation, prevents the planks from sticking to the subfloor, acts as a sound barrier and absorbs excess glue. The planks may adhere to the subfloor without underlayment and the floor will not longer “float”. Buckling could be caused if it will not be able to expand and contract properly.
