Record a mark in context
Underside names, numbers, symbols or stamps can help identify a clay tile, but they should be read alongside its shape and dimensions. Photograph the complete unit and the mark, include scale and orientation, and record the roof area. Use a tile already safely removed during professional work; do not disturb a roof just to search for a stamp.
Distinguish a clue from a conclusion
A mark may identify a maker, mold, product or manufacturing location. A building can also contain salvaged tiles or later replacements. Compare several examples and consult reliable historic catalogs, manufacturer archives or preservation specialists. Do not assign a construction date to the entire roof from a single loose tile without supporting evidence.
Keep the identification useful
Create a record that includes front and back photographs, dimensions, profile, finish, the literal visible wording and any uncertainty. Add the supplier or specialist consulted and the date of the assessment. Store the record with labeled spare tiles. Future owners and contractors can then build on documented evidence instead of repeating an identification exercise from memory.
Further reading & technical sources
Consult the current product documentation and local requirements for your project. These introductions are not installation specifications.
More tile roofing guides
- White deposits on clay tile roofs
- Crazing, chips and spalling on clay tile
- Documenting a historic clay roof before work
Tile Roofing USA editorial guide · Published October 28, 2026.