Re: Tiling bathroom floor with DITRA Underlayment
It is for decoupling the plywood (or concrete slab) movement from the tile job. Lateral (shrinkage/expansion) movement, not flex. You need to shore up/confirm floor system stiffness before proceeding with any large-format tile or stone job.
Originally Posted by maplemale
No, it won't magically turn thin plywood into a stiff subfloor. It's better than hardibacker, because it's thinner, and it's waterproof.
BTW a 3/8" subfloor is never structurally sufficient under any circumstance. 5/8" fir ply on 16" center framing is OK for carpet. It's a rule of thumb that you need 1 1/8" of plywood on 16" OC framing for tile jobs. The framing is ideally at least L= 1/480 (deflection factor 1/480 of the span length.) L720 is a factor safer but of course is more costly because of more material.
Last edited by Sombreuil_mongrel; 04-01-2014 at 11:26 AM.
Remove not the ancient landmark, which your fathers have set.