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Old 03-06-2009, 02:27 AM   #1
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Whats the best way to attach these roofs together?


Hello,
I am glad I found this forum and I am hoping you can give me some great ideas.
I have an addition that is built behind my garage. The addition measures 24' x 24'. The addition is sitting about 4" below the garage roof. The 4" will come in when i take down the over hang on the garage as its about a 2' over hang.
I was wanting to do just a sloped roof off the garage but I am not sure if 4 inches from the old roof to the new roof is enough of a slope since the new roof will run 24'.
I have included some pictures to help explain it better. Please let me know if you have any ideas on how best to approach this.
Thanks for your ideas.
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Whats the best way to attach these roofs together?-roof-pic-1.jpg   Whats the best way to attach these roofs together?-092.jpg  

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Old 03-06-2009, 11:30 AM   #2
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Whats the best way to attach these roofs together?


The minimum slope requirement for proper rain runoff is 1/8" per foot.

You will wind up with 1/6" per foot, so you should be okay with that.

Ed

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Old 03-06-2009, 11:32 AM   #3
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Whats the best way to attach these roofs together?


Oh, that would only be okay using a flat roof material, not for shingles.

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Old 03-06-2009, 12:01 PM   #4
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Whats the best way to attach these roofs together?


Why not turn the new roof 90 and run a ridge board into the existing roof. That way you can keep both roofs the same pitch.
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Old 03-06-2009, 01:17 PM   #5
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Whats the best way to attach these roofs together?


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Why not turn the new roof 90 and run a ridge board into the existing roof. That way you can keep both roofs the same pitch.
This is what I was thinking also but not quite sure how to tie it in the old roof. can i put the ridge board directly on the shingles or should I pull them off? Thanks for your ideas and help.
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Old 03-06-2009, 01:38 PM   #6
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Whats the best way to attach these roofs together?


You would have to pull them off where the 2 new valleys would intersect the original roof, for at least 3 feet wide.

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Old 03-06-2009, 01:53 PM   #7
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Whats the best way to attach these roofs together?


Thanks. I was also wondering what you guys think is the best way to splice 2 pieces of wood together. I know there are many ways but I would like to know what you think. The reason I ask this is because my ridge board would be about 30' and the longest wood i can buy in my town without special ordering is 16'. How wide would you have the ridge board? The reason I ask this is because the garage roof is made of 2" x 4" trusses. Can the new roof be made of 2" x 4" also or would it be better to go to 2" x 6" or 2" x 8"? I live in southern AZ so there is no need to worry about snow or anything like that.
Thanks again for your help.

Last edited by missfixit; 03-06-2009 at 02:39 PM.
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Old 03-06-2009, 02:25 PM   #8
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Whats the best way to attach these roofs together?


Do you think the picture below would be the best way to go or go with the flat roof?
Thanks
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Old 03-06-2009, 07:03 PM   #9
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Whats the best way to attach these roofs together?


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Do you think the picture below would be the best way to go or go with the flat roof?
Thanks
I vote for the plan below, it will give you more than adequate amount of slope. Just my opinion. And to me it will add cosmetically to the house.
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Old 03-06-2009, 07:25 PM   #10
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Whats the best way to attach these roofs together?


plan 2
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Old 03-06-2009, 07:31 PM   #11
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Whats the best way to attach these roofs together?





If you are going to use those valley boards, then miter cut the edge facing the valley, so that the shingles do not have a significant hump to breah.

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Old 03-06-2009, 07:36 PM   #12
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Would 2 x 4 framing be ok ?
Thanks Ed for your help.
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Old 03-06-2009, 07:53 PM   #13
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Would 2 x 4 framing be ok ?
Thanks Ed for your help.
I don't know the load requirements for your area, but typically, 2" x 4" is substantial enough. Doesn't the city need to approve what you are doing anyways? The permit department head building inspector should advise you what can and can not be done for your region.

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Old 03-06-2009, 09:08 PM   #14
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Whats the best way to attach these roofs together?


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I don't know the load requirements for your area, but typically, 2" x 4" is substantial enough. Doesn't the city need to approve what you are doing anyways? The permit department head building inspector should advise you what can and can not be done for your region.

Ed
2" x 4" is enough. I was just wondering if it would be better to use a wider piece for the ridge, better support.
Thanks again
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Old 03-06-2009, 10:00 PM   #15
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Whats the best way to attach these roofs together?


For rafters, 2x4 is not enough. Check the span calculator on www.awc.org For the ridge, it should be large enough to support the entire edge of the rafters.

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