My apartment has a subfloor of 5/8" plywood overlaid with 1-1/2" of gypsum concrete (gypcrete). The gypcrete has lots of cracks which move and rub against each other, creating annoying crunching sounds when I walk on the floor. To eliminate the movement of the gypcrete pieces, I'm thinking of glueing sheets of 3/8" plywood with "No More Nails" to the floor.
I figure that the plywood will bind the gypcrete pieces, and that 3/8" plywood will be rigid enough to help reduce shear stresses on the glue, be flexible enough to conform to a floor that isn't perfectly flat and be thin enough to minimize the increase in height of the floor.
Any comments or suggestions?
Thanks in advance, Darro