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roof loading Websites?

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Is there any information out there that can be used to make sure a roof stays up?  Books?  Websites?
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Location: Hatfield, PA
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I'm assuming you mean load calculations and construction advice?

Rafters - http://www.pole-barn.info/building-rafters.html
Truss plans - http://www.public.iastate.edu/~mwps_dis/mwps_web/tr_plans.html
Snow load calculator - http://courses.cit.cornell.edu/arch264/calculators/example2.3/index.html
Span calculator - http://www.awc.org/calculators/span/calc/timbercalcstyle.asp

Roof Framing

This stuff get's pretty detailed if you want to do it right, you may want to hire an engineer or experienced framer in your area.

Speaking of, care to tell us your area, geography, average snowfall, and ideal roof design? Might be able to help out more then.
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