Cover the entire room with a single layer, trimming it to fit with a utility knife and butting the seams together.
Seal the seams with duct tape.
sold in bundles of 11 to 30 square feet. Calculate the square footage of the room, then add 10 percent to account for off-cuts
sold in 3- or 4-foot-wide rolls
to seal foam underlayment seams
to create expansion gaps between flooring and walls
use only the type recommended by the flooring manufacturer
for attaching shoe molding