What is included in the UL fire test?
The test has three parts. The first is “Spread of Flame”. A roof mockup measuring 4’x 10′ is made and allowed to condition for 30 days. Then the assembly is placed at an incline in a chamber that simulates a 26 MPH wind. A flame is created using a gas burner across the bottom of the assembly and allowed to propagate up the incline for 10 minutes. The flame spread is measured and rated according to Class A, B, C with A being the least flame spread (best rating). The second part is “Intermittent Spread of Flame”. Here the same process is recreated, but the flame is turned off and on during the test. Again the flame propagation is rated as A, B, C. The third test is the “Burning Brand Test” where a pine lattice (called a Crib) is set afire and placed on the roof assembly. If it burns through to the deck, it fails that rating. “A” rating would resist a 12’x 12″ lattice, “B” rating would resist a 6″x 6″ lattice and “C” rating would resist a 2″x2″ lattice.
