@awesomeframers: Chemistry is cool. Polyurethane "foam to gel" adhesive. Did you know you can get a Squeak Free Guarantee from @Huber Engineered Woods Google it to check th details. . This is bonding the Advantech X Factor subfloor to @Pacific Woodtech 20 series I Joists featuring 2 1/2" flanges #framersareadyingbreed #quality #skilledtrades #huberpartner