Five different fire retarde(1building materials,plywood,polyisocyanurate foam boards,polyvinylchloride foam boards,polystyrene foam boards and phenolic foam boards,were combusted one after another together with non−fire retarded materials in one ofthe lst floor rooms ofa flre resistant2story−house in or(ler to evaluate the toxic effects of fire emuents from full−scale fires involving fireretarded materials. The results are summerized as follow, 1) The fires involvingpolystyrene foam boards

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... enolic foam boards ha(1much lowerheatrelease rates and tox− icity of gases than those involving others materials,although the polystyrene which meked and面pped on the floorwould have bume(1ifthe amounts ofnon−fire retardedmaterials were即eateL 2) In preliminary fire experiments it was found that mere40kg ofnon−fire retarded materials and no building mate−