Our house was built in 1975 and has, of course, settled a little bit. There are several cracks in the slab. They are very thin and there’s no big displacement. Should I seal the cracks before laying the floor. My planks call for a 6mil poly sheet and I am also using the optional underlayment pad made by the same manufacturer (Corelux). Any recommendations as to which sealant (e.g. Bluestar, Quikcrete, Crackweld)? Thanx!
Hi Matt… Sorry if this is way too late but perhaps for the benefit of others… Independent of any floor installation concerns, I would seal it just to reduce radon gas. I use to live in an area of the country where it as heavy and years ago we replaced carpet on a slab and did radon readings before and after but we sealed all cracks, even hairline ones and actually sealed the surface as well. It made a significant difference in the gas level afterward. Of course, if radon readings are very high there is venting equipment people can get installed.