The correct substrate depends on the complete wall or floor assembly, installation method, local requirements, labor conditions, and documented product performance.
| Decision | XPS backer board | Cement board |
|---|---|---|
| Handling | Lightweight core can reduce lifting and cutting effort. | Heavier sheet handling may require additional labor. |
| Moisture strategy | Evaluate the board, joints, penetrations, and system details together. | Confirm the required membrane and complete assembly. |
| Procurement | Verify dimensions, facing, evidence, packaging, and market scope. | Verify composition, dimensions, evidence, and installation system. |