Fire Service Ventilation (7th Edition)-All Chapter Numbers

lumber. Joists are usually . 2x6 or 2x8 inch . and are covered with . 1x6 inch . sheathing. In sawtooth roofs, rafters are usually . 2x8 inches or larger . and use wood or metal supports for bracing. The growing use of . 2x4 inch . trusses with gusset plates and . 1/2 or 3/8 inch. plywood decking can present great hazards to firefighters. ................
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