How to Find the Right Underlayment for Laminated Flooring

Examine the subfloor to determine if it is made of plywood and the room is located in an area where no moisture is present, such as above the soil line. If these conditions are met, choose a standard foam underlayment without a moisture barrier.

Walk outside the building to determine if the foundation is raised and there is an open crawlspace under it. If you have a crawlspace and a plywood subfloor, use a standard foam underlayment with a moisture barrier attached, which is also called combination foam/film underlayment or combo underlayment. Also use this underlayment for homes with a poured concrete slab foundation.

Look for a modified, upgraded or closed-cell foam underlayment for large rooms or any area where you want low noise levels since this underlayment prevents echoes and hollow sounds. You can install it in any location and over any type of subfloor.

Purchase a cork underlayment if you desired sound dampening qualities and want a natural, environmentally-friendly underlayment. Also use this if your subfloor is lower than the wall material, such as tile, since the cork comes in a greater thickness and can raise the subfloor height. You can install cork underlayment in basements and other moisture areas, but a plastic moisture barrier is also required.