Title: Flame resistant building material

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Abstract: Building materials of the type containing an impermeable membrane, as for example, an insulation material, or a wall board, or ceiling tile are provided. The impermeable membrane is first formed upon a sheet of paper which gives structural rigidity to the membrane, and is then used as an adhesive to hold the paper onto a porous body by heating the membrane to a softened condition and pressing it against the porous body. The membrane is preferably made in two steps wherein a first application of a thermoplastic latex is put on the paper and then a second application of latex is applied to seal pores in the film produced by the first application of latex. A fire retardant i.e. either a flame retardant salt in the paper or a halogen liberating resin coating on the outside surface is provided to liberate flame extinguishing gases to be held in place by the vapor barrier. In the most preferred embodiments, a halogen containing thermoplastic resin is used as at least part of the material forming the vapor barrier and either another coating of a halogen containing resin is applied to the outside surface of the paper, or a flame retarding salt is included in the paper to produce a building material whose surface has an exceedingly low flame propagation rate.


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