When firefighters think of a "roof," we usually think of the uppermost part of the structure. We also usually think about it as a roof, not as an assembly of many parts and connectors, http://superstroi.site11.com many or all of which are combustible or may be affected by age, deterioration, heat, and other stresses. This distinction becomes especially important to us if we are to be on the roof, or if the roof supports or roof sheathing are combustible and can serve as fuel for a fire in a concealed space.
Photo 1 shows a roof under construction on a Type III (ordinary) building in 2011. Wood plates have been anchored to the top of the masonry walls, and the wood trusses have been nailed to the plates. http://vasilev.site90.net Temporary bracing supports the upper parts of the trusses until the roof sheathing is complete, as it has been at the right in the photo.

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