I'm about to install engineered hardwood floors in my downstairs powder room. The house is on a concrete slab. The instructions talk about "wet areas," which includes bathrooms and powder rooms. The instructions talk about leaving a 5/16" to 3/8" expansion gap around the perimeter and around any pipes, etc. I understand that, but then it says:
I don't understand what the means. Am I supposed to squirt silicon based sealant in the area between the edge of the flooring and the wall? Doesn't that run contrary to the purpose of the expansion area? Where is the floor going to expand to if I fill that area in with silocon? I'm confused.All perimter expansion areas must be completely filled in with a water repellant sealant, a silicone based sealant. When applying sealant, it is helpful to first apply a strip of masking tape parallel to and approximately 1/32" from the edge of the flooring. Then fill the expansion area with sealant, remove any excess with a plastic scraper or putty knife, then remove the tape.