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Old 09-03-2012, 08:29 PM   #1
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Roof over deck


I am putting a roof over my deck (12'x26'). I am wanting to start the rafters about 3' to 4' above the end of my existing roof. The fall will go to about six feet. This should give a pitch just over 2:12. I am going to put shingles on it to match the roof on my house that has just been reroofed.

I am looking for any help on what I should do about such a low pitch roof.

Do I need to find the right angle for the rafters and screw them to the existing rafters?

Any help would be greatly appreciated

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Last edited by chris lewis; 09-03-2012 at 08:37 PM.
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Old 09-03-2012, 11:18 PM   #2
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some photos may aid in getting some useful feedback ....

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Old 09-04-2012, 08:44 PM   #3
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I think for shingles you need at least a 3:12 and thats still pushing it.
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Old 09-04-2012, 10:21 PM   #4
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asphalt shingles are allowed down to 2:12 pitch per the 2009 International Residential Code. See code requirement below.

I would install ice and water shield over the entire roof sheathing before installation of the shingles. be sure to check out the manufacturer's warranty to ensure it covers a 2:12 pitch roof, some do, some don't ....

http://publicecodes.cyberregs.com/ic...9_9_par021.htm
R905.2.2 Slope. Asphalt shingles shall be used only on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. For roof slopes from two units vertical in 12 units horizontal (2:12) up to four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with Section R905.2.7.
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Old 09-05-2012, 06:21 AM   #5
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asphalt shingles are allowed down to 2:12 pitch per the 2009 International Residential Code. See code requirement below.

I would install ice and water shield over the entire roof sheathing before installation of the shingles. be sure to check out the manufacturer's warranty to ensure it covers a 2:12 pitch roof, some do, some don't ....

http://publicecodes.cyberregs.com/ic...9_9_par021.htm
R905.2.2 Slope. Asphalt shingles shall be used only on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. For roof slopes from two units vertical in 12 units horizontal (2:12) up to four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with Section R905.2.7.
I will try to get some pics this afternoon. I assume the ice and water shield would be ok with roofing nails through it?
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Old 09-05-2012, 06:49 AM   #6
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yes, it is self sealing, check out these links:

http://www.homedepot.com/buy/wr-grac...l#.UEctYaP0OSo

http://www.na.graceconstruction.com/...=8&id=144#4854
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Old 09-05-2012, 09:19 AM   #7
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How are you going to support the weight of the roof. I doubt your deck posts and piers will be sufficient. And aesthetically, isn't that roof pitch over that distance going to look a bit weird? Have you simulated things in Sketch Up or something?

Last edited by user1007; 09-05-2012 at 09:22 AM.
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Old 09-05-2012, 09:31 AM   #8
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Chris,

it is not a simple matter of constructing a roof over an existing deck. I commented only in regards to the post for application of shingles on a low slope roof. Now to your original post.

structural issues must be addressed and loads must be accounted for, members sized, connections designed, load paths determined, and code requirements met. You should check with your building department and find out if permits are required, and what drawings must be submitted. You should invest in hiring a local professional engineer to design your structure.

sdsester is spot on! what you have may not be sufficient. You could spend your hard earned money and build it only to find out afterwards the foundation is sinking or leaning, the first wind storm causes damages not only to your new roof, but your existing home as well because of your construction.

no one likes to spend money for an engineer, but they will come up with a design so its done correctly the first time, which in the end saves you money and time.

Good luck!
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Old 09-05-2012, 11:14 AM   #9
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That is the claim but in reality we have found it to not be entirely true.
We still use it as well on low slopes we use roofing cement (tar) from tubes to caulk between the butt joints of adjacent shingles and on every nail head.
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Old 09-05-2012, 12:46 PM   #10
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Can you go higher up the existing roof? Deck and patio covers are often at shallower pitch than house, doesn't look too weird because of what it is. Similar to some salt box with lean to. Pay close. attention where new joins old. Flashing, real good flashing. After all that double felt and self sealing membrane and tarring butts and under tabs, you dont want rain running down underneath it all
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Old 09-05-2012, 07:21 PM   #11
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Can you go higher up the existing roof? Deck and patio covers are often at shallower pitch than house, doesn't look too weird because of what it is. Similar to some salt box with lean to. Pay close. attention where new joins old. Flashing, real good flashing. After all that double felt and self sealing membrane and tarring butts and under tabs, you dont want rain running down underneath it all
I was originally going to come off the apex of the roof but it isn't going to change my pitch. My pitch is 4:12. TO follow the pitch of the roof the outside wall would have to be aproximately 55". That is to low. I have dropped the outside wall to 6' which gives me 2:12 from the end of the existing rafters. I have now decided to go up the roof 3-4' and try to get a little more. I can go with a GAF product for low pitch roof but it is in a roll and asthetically I don't think it would look as good as the shingles
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Old 09-05-2012, 10:27 PM   #12
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Just do a gable roof and then you won't have to worry about it.
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Old 09-06-2012, 12:09 AM   #13
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very nice Robert, love the deck!

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