Michael Cox from Rock Hill (SC) Fire Department sent in these photos of an interesting fire that the crews from Rock Hill were recently faced with. The crews quickly discovered that it was the roof decking that was burning; however, they were having a difficult time accessing and extinguishing the portion of the roof decking that was on fire. The roof system they encountered is called a Ventilation Rib System. The system consists of a corrugated metal decking, 4 inches of Styrofoam insulation, 7/16” OSB, and then finally covered with asphalt shingles. The system is designed to maintain a steady airflow under the shingles to keep them cool. In this particular fire, the insulation was burning in-between the metal decking and the OSB, making for the stubborn fire and difficult access. The crews discovered that once the main body of fire was knocked down, simply backing out the 6” screws was the most effective way to open it all up for overhaul. Several crews spent nearly 9 hours removing the decking and performing overhaul.
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Ventilation Rib System
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