Evaluate the conditions at each elevation
Record sun exposure, drainage, splashback, nearby landscaping, access for cleaning, and existing deterioration. A sheltered entry and an exposed wall may need different detailing even when the visible finish is the same.
Review the assembly behind the finish
EPA guidance connects moisture management across drainage, walls, roofs, and building systems. Ask how the proposed materials integrate with flashing, openings, sealants, drainage paths, and the retained construction.
Compare the owner’s obligations
- Installation instructions and substrate preparation.
- Product-specific limitations and compatible accessories.
- Cleaning, recoating, inspection, and repair access.
- Availability of matching material for future repairs.
- Warranty coverage, exclusions, and maintenance documentation.