- Class A, B, and C Roof Ratings - UL Solutions Code Authorities
This standard includes three classes of fire exposure: • Class A roof coverings, which are effective against severe fire test exposures • Class B roof coverings, which are effective against moderate fire test exposures • Class C roof coverings, which are effective against light fire test exposures
- Class A, B, and C Roof Ratings Explained (2025) - cedur. com
What Is a Class A Roof Covering? Class A roof covering provides the highest level of fire resistance Typically, the roofing materials with class A classification ratings can withstand severe and, sometimes, even direct fire exposure—without igniting or spreading flames
- Class A, B and C Roofs - UL Fire Classifications for Roofs
Class A fire testing is considered severe fire test exposure, while Class B is considered moderate fire test exposure, and Class C is considered light fire test exposure
- Flame Spread Ratings: What Class A, B C Mean for Building Materials
Class A identifies the best performing materials, falling within the range of 0 to 25 FSI Class B is mid-range, with 26 to 75 FSI, and Class C is the lowest rating of 76 to 200 FSI All classes have a code-specified smoke developed index (SDI) limit of 450
- Fire Ratings for Roofs: Class A and Product vs. Assembly
What Is a Class A Fire Rating for a Roof? A Class A fire rating is the best fire rating you can achieve for a roof Many companies use the UL 790 to test to achieve Class A fire ratings for roofing products Class A ratings are ideal and, in some cases, required for various applications, including:
- Class A roofing materials: Top 7 Powerful Fire-Safe Choices 2025
Discover top Class A roofing materials for fire protection Learn about ratings, options, and how to safeguard your home today
- Class A Fire-Rated Roofing: Understanding Roof Ratings
Class A is the highest, meeting stringent requirements, whereas Class C is the lowest ASTM E108 outlines three critical criteria for Class A fire rating: Flame spread resistance – Class A fire-rated roofing material must demonstrate the ability to resist spreading flames on the surface
- Class A Fire Rating - IronRidge
The testing evaluated the system’s ability to resist flame spread, burning material and structural damage to the roof Refer to the table below to determine the requirements for achieving a Class A Fire Rating on your next project Tech Brief
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