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If we use a Torchon membrane on the roof , what is the risk of catching the house on fire while it is being done?

April 26, 2017catching House membrane risk roof torchon

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If we use a Torchon membrane on the roof , what is the risk of catching the house on fire while it is being done?

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A. On new timber framed construction, the plywood roof deck substrate and the dwangs which may be used to support the upstands are primed with a bitumen primer. As well as aiding the adhesion of the Torchon membrane to the substrate, the primer acts as a fire retardant when dry, and stops scorching of the timber surface.