I'd like to put a roof over my deck. Its easy to find tables to calculate timber for decks, but not for roofs.

Is the load calculation the same for a roof/deck cover as a deck (e.g. 10 lb/sf dead load, 40 lb/sf live load)? Does one treat the live load of a roof (snow) the same as live load for a deck?

Attachment 24336
the deck is 12' deep, and there is a beam down the center that I can use to support the posts of the cover. I plan to cantilever out 2-3' (3' shown).

Why does it matter? I'd like to use light lumber (2x6) AND space the posts(~10') out so they don't get in the way too much.

thanks!

beam down center? Hmm.. you must make sure you are up to code in your area, consult with your towns building dept... it looks like you will need a bld. Permit for such a project even if it is just a replacement project.. the girder beam has to be up to spec. the roof cantilever should be within maxium load for 2x6 @16oc sheathing minimum thickness I think for low pitch is 3/4 plywood or compatible materials. Your footings will likely need inspection too.. in my opinion, you can take that sketch with you downtown and explain/ask a town inspector what is needed or required for such a project. I'm sure up in the air work like that is worth getting a permit

Can you shoot some pic's of your existing structure ?underneth as well

Thanks, Jon, zippit
I live in the boonies, so there are no permits, but no one to ask questions either. Armed with information (from helpful replies like yours) I can call neighboring cities.

I'll put up a few pictures to better show the situation later today, zippit

You know pwd.. a closer look at your sketch shows that you intend to secure your roof rafters to the siding/sheathing?. you maybe better off cutting and laying you rafters along the original roof rafters.. cutting a small birdsmouth to rest on the top plate and secure your new rafters by nailing into the original roof rafters.. you will be better off with a roof that continues through without any breaks.. but whatever floats your boat.. I've seen small awning/shed rooms done that way too.

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Originally Posted by jon123

you know pwd.. a closer look at your sketch shows that you intend to secure your roof rafters to the siding/sheathing?.. you maybe better off cutting and laying you rafters along the original roof rafters .. cutting a small birdsmouth to rest on the top plate and secure your new rafters by nailing into the original roof rafters..you will be better off with a roof that continues through without any breaks .. but whatever floats your boat..i've seen small awning/shed rooms done that way too.

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Good point, I think I would have to have a pro do that, and it would look much cleaner and be taller (good). May I'll wait on this...