I am replacing my vapor barrier that was poorly done. It did not even go up the walls, all the tape is coming up. Its a redo. I have a conditioned crawl space with the exterior walls made of ICF. What do I use to seal the 12 mil POLY to the ICF crawl space wall? Will butyl tape work? Thank you for your help!
GAD

I use a/c mastic on the wall. Apply mastic, pull barrier up just past mastic and secure barrier with a 1x3 placed over the mastic and screwed to the wall. This forms an air tight seal. It's messy but it seals completely.

Never thought of that. Thanks for your help

Best product to use is THE BARRIER   read about it and you will see why, is a vapor barrier/ radon barrier, bug resistant, insulator and much more. www.barrett-inc.com/barrier.php