Roof tile mortar shall be a premixed unit having product approval and test in compliance with which standard?

• A. TAS 123
• B. ASTM C144
• C. UL 971
• D. ANSI A118

Answer: (A)

The key idea here is that roof tile mortar used in tile roofing must be a premixed product that has undergone formal product approval and testing to a recognized standard. That standard is TAS 123, which specifically governs premixed roof tile mortars and sets the requirements for their composition, test methods, and certification so they can be approved for use on tile roofs. This ensures the mortar will perform reliably with roof tiles, bond properly to the tile and substrate, and stand up to Florida’s weather conditions.

Other standards don’t fit this purpose: ASTM C144 deals with aggregates for concrete, not premixed roof tile mortars; UL 971 and ANSI A118 cover tile adhesives and mortars in broader tile installations (often interior or non-roof contexts) and don’t address the dedicated roof tile mortar product approval process. So TAS 123 is the standard that directly aligns with premixed roof tile mortars requiring product approval and testing for roofing use.