I am getting ready to install 5/8" bamboo flooring down to a concrete
slab and have hit a stumbling block. I removed my wonderfully cheap
linoleum and found a crack in the slab that appears to allow some
moisture through at some point. I have moisture tested the floor in
other areas using the quick and dirty 24" square of 6 mil poly sealed
down and it passes. I(f I end up installing the bamboo floor, I am
going to get a more thorough test done) . So my question is,how
should I patch the crack and is there a vapor barrier system that
would be appropriate for this installation? I had planned on using
Roberts 1408 adhesive. I know that bostik has a system of mvp and
bostik best but I have had a hard time finding in my area. Can I use
asphalt mastic to glue down 15lb roof felt and then glue my floor on
top of that? Any other ideas.

Thanks for the help

Drew