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Fire Retardant Treated Wood in Panelized Roofing

This 1.2 million square foot warehouse was developed for multiple tenants and features a hybrid panelized roof system utilizing Pyro-Guard® fire retardant treated wood.  The hybrid roof system consists of 4 ft x 8 ft fire retardant treated plywood on 2x and 3x fire retardant treated sawn lumber subpurlins.  The primary framing consists of steel bar joist spaced 8 ft on center with steel girder trusses as the main structural members.  This system uses panelized units assembled on the ground and then lifted into position at the roof level, where the steel bar joists are welded or bolted to the primary steel girder trusses.  The free edge of the wood decking for each panelized unit is nailed to the framing edge of the previously placed unit.  Pre-framed panel ends attached to the main steel trusses complete the assembly.

In a fire retardant treated wood roof system, the panelized wood sections speed the erection process and add strength, dimensional stability, and high diaphragm capacity to the roof.  The ability to pre-frame large roof panelized units reduce cost, cuts construction time, and enhances job site safety since fewer man-hours are spent on the roof.  Panelized roof systems are one of the safest systems to erect because most of the work is accomplished on the ground during the fabrication of the large pre-framed roof panels.  Once the large panels are lifted into position at the proper roof elevation, only one or two workers are required on the roof to complete the final purlin attachments and diaphragm nailing. 

Another advantage to the hybrid panelized roof system is the speed at which it can be constructed.  In this case, the entire 1,200,000 square-foot roof was erected in only 5 weeks with minimal overtime required.  An experienced 4 man crew can erect 25,000 square feet of roof per day