I've read that the boards should be cut so they line up with the joists underneath the subfloor (similar to hanging drywall). I've also read that the minimum subfloor should be 5/8" of plywood, and that 1 1/4" screws should be used (also similar to drywall). The difference is that drywall is attached directly to studs, whereas with the backerboard, those screws won't make it through the 1/2" of backerboard plus 5/8" of floor (yes, 1/4" past, but not enough to justify screwing over joists.) Comments?
- posted
20 years ago