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Building Construction Concerns for Firefighters: Steel Truss Double Roof

Article and photo by Greg Havel During the past several years, a number of articles have appeared on fire service Web sites and in fire service publications regarding the installation of "double roofs" or "rain roofs" on top of the original construction and roofing materials. These are installed to eliminate roof leaks and provide better roof drainage; and to provide space to add insulation under the roof. These double roofs are usually built of trusses, plywood, or OSB sheathing, and shingles of asphalt, wood, or metal roofing. (1) Photo 1 shows a second roof being added to a school building in southeastern Wisconsin. The original school was built in 1938, with a pit...

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