Can Green Glue be used in floors?
Absolutely, in fact when used in floors, Green Glue yields a double benefit – it helps with both impact (footstep) noise and airborne sound, and is very effective at both. Green Glue may be used between layers of subfloor, between subfloor and tile backer board, and between thinset mortar and the surfaces below. You may be able to use 2 layers of thinner subfloor if convenient.