Concrete sealer Bostik MVP vs. roofing felt

I plan to install engineered hardwood flooring on our basement floor. The house had a slight moist smell when we moved in, but no evidence of moisture damage. A dehumidifier eliminated the smell. I haven't lifted the carpet yet to do a moisture test, but suspect it might fail. I have heard of using Bostik MVP to seal the concrete. I have also heard of putting down two layers of roofing felt sealed with mastik between each layer. Does anyone have experience with any of these products?

 

You really need to be aware of moisture issues in a basement.

I don't have a basement but I use #15 roofing paper. Depending on the slab moisture content you may or may not want to use the roofing mastic. Personally in my home, I put down a 1/8" layer of roofing mastic directly to the concrete and then embedded the #15 paper into the mastic as I went.

This was under 3/4" kiln dried CDX plywood and 3/4" solid hardwood was nailed into that, so I really have no plan of removing the subfloor ever. As mentioned I would not do this type of install in a basement but the slab prep can be handled in a similar fashion.

 

I highly suggest a floating installation, only if the concrete passes the moisture VAPOR test.