Flooring · definition
A layer (e.g., Ditra-type) between subfloor and tile that absorbs substrate movement so tile and grout don't crack — standard over wood subfloors.
Source: Schluter — Uncoupling Membranes (DITRA)
Where this term lands on a Columbus budget
The cost pages carry the current local ranges, and the guides explain what moves them. A published range becomes a project number only after someone looks at the site.