Old 8”x8” ceramic tile lasted 30 years without it with no cracking or grout issues. It’s all been removed now.
Joist deflection is well above the requirement for ceramic or porcelain. We have osb subfloor with exterior grade plywood over the top, the total stack height is like 1 1/8” or 1 1/4”. We are going to lay 12” x 24” tile. Is Ditra or equivalent necessary to keep the new stuff from cracking or delaminating considering it’s a larger format? I’ve always done work over top of concrete or concrete board so working with the mat will be new, if we do need to use it.
Thanks in advance.