Posted by TonyIN on October 31, 2009 at 08:05:14 from (72.49.225.36):
In Reply to: OT: lightweight roof posted by Dan-IA on October 31, 2009 at 06:45:10:
Not sure if I understood correctly, but it sounds like you're using conventional 2x4 wall framing with plywood over the 2x's for the walls? If so, even with the 2x4's at 24" o.c. you've basically got typical house framing for the walls. That should support most roof systems just fine. Now for the rafters... if you're going 16 ft, 2x8s would be about the minimum or it will sag over time. 2x4's have a hard time supporting their own weight over that span. Not only that, but the quality of lumber for 16 ft lengths isn't that great until you get into 2x8's. 2x8's are also usually a better grade of lumber - i.e. a structural grade. Keep your rafters at 24" o.c., lined up with the studs below, and 1/2" plywood sheathing is fine - be just like your house roof. Possibly a cheaper route if you can find it is some old insulated panels - usually 2 to 3" thick rigid foam with a thin plywood or other type board on each side. span these at 4' o.c. (but don't walk on them) and it should hold. 24" o.c. is better. Some items to consider: Most of your heat loss will be through the roof in any design. The steeper the roof slope, the less snow load/weight. Ultra cheap/ugly route? Check with a local signage shop - they usually have old 4x8 plywood signs laying around. Lumber yards also have 4x8 sheets they couldn't sell for various reasons that they will sell very cheap. Good luck.
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