Internachi Inspection Graphics Library Roofing в Calculations в If you are an internachi member or have received written or email permission to use this image, you may download it in high resolution. if you are aware of any person or entity using any internachi image or intellectual property without authorization, please contact internachi. rafter length calculation: rafter length calculation. Internachi inspection image gallery roofing calculations home inspection images 2 10 rule 1 2 10 rule 1 2 10 rule 1 roof with common rafters: rise over run.
Internachi Inspection Graphics Library Roofing в Calculations в Specific inspection topicsstructural inspections. lfoster (linda j. foster, trec # 7654) april 22, 2007, 3:53am 1. this home is new construction with tile roof. the roof rafters are 2x8 on 16" centers with 2x10 ridges. several roof rafters have been spliced in a ‘v’ pattern near the roof ridge; several have a plywood scab brace on the side. Step one: calculate the roof pitch. the roof pitch is the angle of the roof and can be measured in several ways, but is most commonly expressed in rise over a standard 12 inch run. but, in order to calculate the rafter length, we need to calculate the pitch in degrees. the angle in degrees is equal to the inverse tangent of the pitch of the roof. Bonding of shingle sealant strips is the most important factor in the resistance of shingle roofs to wind damage. you should consult with a qualified roofing contractor to determine the best course of action. bonding: none bonded, old roof. asphalt shingle sealant strips had failed to bond shingles to each other. Conventionally framed roofs have rafter ties installed (typically ceiling joists) that connect the bottoms of opposing rafters together. this keeps weight of the roof from spreading the tops of the bearing walls outward, which would allow the ridge to sag. load path. in a conventionally framed roof, the entire roof load is typically transferred.
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