UL 790 - Fire Tests of Roof Coverings
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12 Terms
What does UL 790 evaluate?
Fire resistance of roof covering materials.
What are the three fire classifications in UL 790?
Class A - Highest resistance
Class B - Moderate resistance
Class C - Basic resistance
What three main tests are included in UL 790?
Intermittent flame test
Spread-of-flame test
Burning brand test
What is the burning brand test?
A burning wood brand is placed on the roof surface to evaluate fire penetration and spread.
What does the spread-of-flame test measure?
Flame propagation distance
What does the intermittent flame test simulate?
Repeated flame exposure from external fires.
Why is UL 790 critical in construction?
It ensures roof assemblies can resist external fire exposures.
UL 790 Class A means:
UL 790 burning brand test simulates: