Does spray foam burn?
Yes spray foam will burn. However it will not support a flame. This means that the foam has not fuel value in a fire. It needs something else burning in order for it to be consumed. When burned in the lab foams self extinguish. Once the flame is removed the fire goes out. In Canada foam plastics need to pass the Can/ULC S102 corner wall test. This is a pass or fail test measuring flame spread index and smoke development. One cannot have a CCMC certified foam without passing this test.
