UL 790:2022 free download STANDARD FOR SAFETY Standard Test Methods for Fire Tests of Roof Coverings
Scope
1.1 These requirements cover the measurement of the relative fire characteristics of roof coveringsexposed to simulated fire sources originating from outside a building on which the coverings are installed.They are applicable to roof coverings intended for installation on either combustible or noncombustibleroof decks (see 1.4) when the roof coverings are applied as intended.The following test methods areincluded:
a) Intermittent-Flame Exposure test;
b) Spread of Flame test;
c) Burning Brand test;
d) Flying Brand test; ande) Rain test.
1.2 Three classes of fire exposure are described.
a) Class A roof coverings that are expected to be effective against severe fire exposures.Undersuch exposures, roof coverings of this class afford a high degree of fire protection to the roof deck,do not slip from position, and are not expected to produce flying brand.
b)Class B roof coverings that are expected to be effective against moderate fire exposures.Undersuch exposures, roof coverings of this class afford a moderate degree of fire protection to the roofdeck, do not slip from position, and are not expected to produce flying brand.
c) Class C roof coverings that are expected to be effective against light fire exposures.Under suchexposures, roof coverings of this class afford a light degree of fire protection to the roof deck, donot slip from position, and are not expected to produce flying brand.
1.3 Tests conducted in accordance with these requirements are intended to demonstrate theperformance of roof coverings during the types and periods of fire exposure involved, but are not intendedto determine the acceptability of roof coverings for use after exposure to fire.These fire test methods donot provide a basis to compare expected performance under all actual fire conditions but they do provide abasis for comparison of the response of roof coverings when subjected to fire sources that are describedherein.
1.4 These test methods address roof coverings used over both combustible and noncombustible decks.A combustible deck is generally constructed using materials that do not comply with the requirements ofASTM E136,such as wood sheathing boards，oriented strand boards (OSB),or plywood. Anoncombustible deck is generally constructed entirely of materials that comply with the requirements ofASTME136,such as metal,concrete, or poured gypsum.
2Units of Measurement
2.1Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.
3 General
3.1 Representative samples of a roof covering material, assembled to test decks as described in Section 4, are to be subjected to the applicable tests described in Sections 6 – 11 as specified in Table 3.1.
UL 790:2022 free download
