I can cut two boards and nail them together, but that doesn’t make me a framer.
What I’m wondering is how to tie a new roof in with an existing roof. The attachment shows the details. The black is what is already in place and the red is what is proposed. I just don’t know how to properly attach the new roof to the old. Adding posts to support the “ridge” end is not feasible.
The existing roof has asphalt shingles. The addition will have standing seam metal with mechanically joined seams. They are approved for use with 1/2″:12 pitches or greater. The pitch on this project will be about 2:12.
Take a look.
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This is a bump, not a real response -- the framers will be along shortly. The porch rafters need to rest on the top plates of the wall as do the house rafters. My guess is that the framers will say that they are toenailed to the plate and side nailed to the house rafters.
What are your plans for keeping weather out of the house when this is happening?
Weather in the house won't be a problem. I'm extending a covered deck/porch. It's presentlyy 7'3" wide by 26'9" long. I'm just taking it another 7' out.
You've got me confused! if irt is already out 7' and you are taking it out another 7' then it is going to be 14' out, yet your drawing shows only 7' If it is already attached, just follow the same process already used.
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Its always better to tie into the structure (i.e. wall or beam) than the fascia, which is only nailed into the rafters' end-grain, and is not structural. I generally lag-bolt a ledger, (2 lags @ 16" o.c.) then use Simpson hangers, or pressure-blocking.
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What Huck said.
You in snow country? That transition from shingles to metal looks like ice dam problems..maybe not.
I didn't do it....the buck does NOT stop here.
"You in snow country?"
Nope. We get "significant" ice about once a year.
Either re-frame the existing porch roof so it's a single plane extending from where it ties into the house or lay this on the existing porch roof (which would look silly). To remove the existing porch roof and reframe it would give you a better pitch also.
Is this what you're referring to? Another good option, but a little more involved, since you have to cut the roof back to the top plate along the patio roof area. Definitely the way it would be built if the patio were framed the same time as the house.
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"Either re-frame the existing porch roof so it's a single plane extending from where it ties into the house or lay this on the existing porch roof (which would look silly). To remove the existing porch roof and reframe it would give you a better pitch also."
I don't think that's an option. The roof that covers the deck is about a 4:12 pitch. Taking it out 7 feet would make it 2:12. It's the whole reason I'm trying to talk to owners into going with a metal roof.
I'll try to get a picture of the backside of the house. I tried drawing a diagram, but it just won't be as good as the real thing.
Thanks for all the advice so far. Remodeling can sure be tricky sometimes. It's easy to visualize several different ways to do something, but it seems like they all have their faults.