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Old 05-24-2007, 09:00 AM   #1
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new roof


I have added on a 10 foot addition onto the backside of my house. I want to tie the roof in with the existing. I have decided to go all the way to the ridge of the existing house and change the pitch to a 5/12 to cover the new addition.

The lumber will be about 19' from ridge to overhang. What size 2x should I use? Would 2x6 be sufficient 16" o.c or should I go with 2x8's

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Old 05-24-2007, 05:14 PM   #2
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Originally Posted by What have I done View Post
I have added on a 10 foot addition onto the backside of my house. I want to tie the roof in with the existing. I have decided to go all the way to the ridge of the existing house and change the pitch to a 5/12 to cover the new addition.

The lumber will be about 19' from ridge to overhang. What size 2x should I use? Would 2x6 be sufficient 16" o.c or should I go with 2x8's

Thanks
How did you even get this approved by the town without any rafter sizes on a drawing or a set of Architectural plans?

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Old 05-24-2007, 08:04 PM   #3
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back we are we don't require permits and such! But I still want it done right. any suggestions would be greatly appreciated
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Old 05-24-2007, 08:09 PM   #4
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I would guess you should use AT LEAST the size that's on the existing house. It's insane to do this without engineering.
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Old 05-24-2007, 10:10 PM   #5
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I have gotten a lot of great advice from diychat and thought this would be a no brainer for seasoned framers.

The original house is only 16'6" wide so 8'3" to ridge with a 8/12 pitch

on the backside I added 9'1" so from the ridge to the outer wall is now 17'4"
I know the pitch will be shallower on the backside roughly about a 5/12.
The original trusses are the true 2x4" sized I know I need to use bigger dimmensional lumber with todays lumber.

I roughly calculated the lenght of the new rafter to be 19'4"
My question is will 2x6 be beefy enough using todays lumber (5 1/4") or should I pay the lil extra for overkill and go with 2x8"
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Old 05-25-2007, 12:17 PM   #6
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I would go with the 8s that is a long way for a 6 to span. It also depends on where you live (snow load). A lot of these guys do not understand what it is like to live in a truly rural area where building inspectors do not exist, or if your town has one he is the local bartender who is working 5 hours a week inspecting things he does not know anything about. My county has some good inspectors but they do not go into the towns, so it is up to each little town to have their own inspector. What kind of (if any) inspectors do you think you will get in a town of 800 people.

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