Choose the tile-setting mortar using the current Prodeso handbook and the mortar manufacturer’s instructions.
Yes—the linked Prodeso Heat handbook shows both modified and unmodified thinsets for setting tile over the membrane in its illustrated assemblies. The earlier blanket statement that tile above Prodeso must always use unmodified thinset is not supported by that handbook.
Consult the thinset manufacturer for the appropriate mortar and curing time for the specific tile and assembly. Separately select the mortar or adhesive that bonds the membrane to the substrate using the handbook’s instructions for that substrate.
Do not assume that a product approved beneath the membrane is also approved for setting tile above it. Follow the complete Prodeso instructions, including minimum tile size, movement joints, and waterproofing where required. This article does not certify a particular third-party adhesive or an assembly outside those instructions.
Sources
- Manufacturer instructions (publication 5049), PDF pp. 6–12.
