Fire Rating For Sloped Roof Truss Assemblies


A question has come up concerning sloped roof trusses and fire assembly ratings. Some are reluctant to rely on test results from flat (parallel chord) trusses applied to sloped roof trusses. Do you have any information regarding the suitability of the fire rated ceiling assemblies for sloped roof trusses? Does the “minimum depth” requirement of the parallel chord assembly apply to the minimum depth of a sloped roof truss (i.e., heel height?)


The reluctance to rely on approved test results is unwarranted as explained in section 17a and section 17b of SBCA’s Metal Plate Connected Wood Truss Handbook. For additional information on fire resistance-rated assemblies, see SBCA Research Report 1509-01: Fire Resistance Rated Truss Assemblies.

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