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Thread Starter 

This might be useful for first time coop builders...like me, who wants a really nice roof on mine

 

http://www.blocklayer.com/roof/gambreleng.aspx

http://www.blocklayer.com/roof/

http://www.mycarpentry.com/roof-pitch-calculator.html

http://www.wendrickstruss.com/calculator/index.asp

 

I know of more, but I have used these for other projects, found them to be pretty helpful.