In 1971, 37 different tile manufacturers who had previously each had their own installation recommendations joined together to form the Tile Roofing Industry Alliance (TRIA). Working together, they created a standard set of installation recommendations for both clay and concrete tile, and for moderate and cold climate zones. These installation manuals are available as free downloads from their website.
- The International Residential Code (IRC) also supplies standards for tile installation. Inspectors should take the time to learn which standards are applicable in the areas in which they inspect.
- The National Roofing Contractors Association (NRCA) also provides standards for roof-covering materials.
- Jurisdictional requirements may apply, especially in areas designated "High Wind".
Note: Installation practices vary by jurisdiction and by local best practice.