ICC-ES AC165
Full Name
ICC-ES AC165 – Acceptance Criteria for SBS Modified Asphalt-coated Glass-fiber-mat Roof Underlayment
Scope
ICC-ES AC165 defines the acceptance criteria for evaluating SBS (Styrene-Butadiene-Styrene) modified asphalt-coated glass-fiber-mat roof underlayment. The criteria focus on ensuring the underlayment’s suitability and performance in various roofing applications.
Key areas covered by the criteria include:
- Material composition: specifying the required composition of the underlayment, including the type and weight of the glass-fiber mat, the properties of the SBS modified asphalt coating, and any other components.
- Physical properties: defining minimum requirements for tensile strength, tear resistance, puncture resistance, flexibility, and other mechanical properties that ensure the underlayment’s durability and resistance to damage during installation and service.
- Water resistance: evaluating the underlayment’s ability to resist water penetration, including testing for water vapor transmission and resistance to hydrostatic pressure. This is crucial for preventing moisture-related issues in the roof assembly.
- Durability: assessing the underlayment’s resistance to weathering, UV radiation, and temperature extremes to ensure it maintains its performance over time and under various environmental conditions.
- Compatibility: ensuring the underlayment is compatible with different types of roofing materials and adhesives, preventing any adverse reactions or interactions that could compromise the roof system’s integrity.
Overall, ICC-ES AC165 serves as a guideline for evaluating the performance and suitability of SBS modified asphalt-coated glass-fiber-mat roof underlayment, providing confidence to building officials, designers, and contractors regarding its reliability and effectiveness in protecting the building envelope.
Resources
Keywords
SBS modified asphalt; glass-fiber-mat; roof underlayment; acceptance criteria; tensile strength; tear resistance; puncture resistance; flexibility; water resistance; water vapor transmission; hydrostatic pressure; weathering; UV radiation; temperature extremes; compatibility; roofing materials; adhesives