UL 790:2018 pdf download.Standard Test Methods for Fire Tests of Roof Coverings.
4.3.2 The length of the test deck is to be:
a)13 feet (3.9 m) for Class C tests,
b) 9 feet (2.7 m) for Class B tests, and
c) 8 feet (2.4 m) for Class A tests.
4.4 Application
b) 9 feet (2.7 m) for Class B tests, and
c) 8 feet (2.4 m) for Class A tests.
4.4 Application
4.4.1 The prepared roof covering material to be tested is to be applied，in accordance with the testsponsor's instructions, to the applicable number of test decks as specified in Table 3.1.The material is toextend to, and be flush with, the edges of the deck on the sides and top.At the leading edge , the materialis to be positioned such that there is minimum coverage,or a minimum number of layers, over thehorizontal deck joints. For mechanically attached and fully adhered single-ply membrane roof coveringsystems it is not prohibited to pull the membrane taut over the edges of the assembly to fit snugly againstthe deck and secure it to the wood supports of the test deck. lt is permitted to provide an air-seal alongthe sides of the representative sample of the roof covering material or system to restrict air flow under thesystem during the fire test. The use of a 1-in (25-mm) width metal batten strip or wire fastened on top ofand along each side edge is not prohibited for mechanically attached single-ply membrane roof covering systems.
