Download Technical Data Sheet Before you start laying your new vinyl click floorboards, spread out the Contract Foam Underlay. Prepare a scalpel & clean the concrete as much as you can. After that, you’re ready to: Cover the floor with the underlay and cut the extra material with the scalpel Leave a small gap between the wall, about 5 mm. You are ready to lay down the floorboards. Width: 1 m Thickness: 1 mm Roll size: 50 m²