Core terms · definition
A rigid cement-based panel used as a stable, water-durable substrate for tile in wet areas — preferred over drywall behind tile in showers and on counters.
Source: Ceramic Tile Education Foundation — Guide to Underlayment for Tile
Related terms
Where this term fits in a remodel
The pillar guides set terms like this one in context — what the work involves, what drives its cost, and where it sits in the sequence of a project. Pricing a specific house takes a defined scope and an on-site assessment.