Underlayment for clay roof tile shall comply with the following standard?

Underlayment for clay roof tile shall comply with the following standard?

• A. ASTM A 354
• B. ASTM D 226
• C. UBC 15-1
• D. UBC 15-5

Answer: (B)

Clay roof tile installations rely on a water-shedding underlayment whose performance is defined by a product standard. ASTM D226 sets the requirements for asphalt-saturated felt used as roof underlayment, including properties like tear resistance, flexibility, and water resistance that are crucial for tile systems. This underlayment must withstand the installation process, wind uplift, and exposure under tiles, while providing a reliable secondary barrier if the tile layer is compromised. Because D226 specifically addresses asphalt-saturated felt used as roof underlayment, it is the applicable standard for clay tile applications. The other options do not define the standard properties for this type of underlayment. So the appropriate standard is ASTM D226.

Clay roof tile installations rely on a water-shedding underlayment whose performance is defined by a product standard. ASTM D226 sets the requirements for asphalt-saturated felt used as roof underlayment, including properties like tear resistance, flexibility, and water resistance that are crucial for tile systems. This underlayment must withstand the installation process, wind uplift, and exposure under tiles, while providing a reliable secondary barrier if the tile layer is compromised. Because D226 specifically addresses asphalt-saturated felt used as roof underlayment, it is the applicable standard for clay tile applications. The other options do not define the standard properties for this type of underlayment. So the appropriate standard is ASTM D226.