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https://www.constructionknowledge.net/public_domain_documents/Div_6_Woods_Plastics/Partial%20Carpentry%20pdfs/Roof_Framing_&_Roofing_%20Army_FM5-426.pdf
interior support or bracing. In long spans, the roof would sag in the middle if it were not strengthened in some way. To support long rafters, braces or other types of supports must be installed. Rafter Layout Rafters must be laid out and cut with slope, length, and overhang exactly right so that they will fit when placed in the roof. Scale or ...
http://web.mit.edu/4.441/1_lectures/1_lecture13/1_lecture13.html
It will do so until a foot kicks it or moves it. At that moment the plank will move because the simple connection cannot develop any resistance to the lateral loal. A simple support can be found as a type of support for long bridges or roof span. Simple supports are often found in zones of frequent seismic activity.
http://www.cooperindustries.com/content/dam/public/bline/Resources/Library/catalogs/pipe_hangers/pipe_hangers_and_supports/Dura-Blok.pdf
The DURA-BLOK is UV resistant and is suitable or any type roofing material or other flat surface. For sloped surfaces see page 289 for adjustable hinge fitting (B634). The open ends allow for easier adjustments to DBE, DBR, and DBM series supports. A drainage channel through the center of the block keeps water from pooling under the support.
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