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Old 08-14-2010, 01:26 AM   #1
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Question about reroofing


I am very comfortable with just about every other type of DIY work, but roofs have always scared me. I promise to consult a professional, as I know that will be one of the suggestions, but I wanted to know if this was even possible.

I am in the process of buying a foreclosed house that appears to have had a back patio closed in and added to increase square footage. It has a gable roof that originally was about 26' deep, but the addition was another 10' off the back. They put a roof over the addition but it is near horizontal; barely any slope at all and has led to water leakage. I want to just reroof the back and make it a continuous slope, but if I did the slope would still be extremely shallow (28' long with only a 3' rise)

My questions is this: Can I extend the peak of the roof without having to completely re-roof the front half? Basically splice in to the front face of the roof to make the peak higher and farther back (by my calculations about 5' in order to get the peak in the center of the house)

I will try to get an illustration for this if it is not clear enough.

Edit: Ilustrations in next post


Last edited by spydrplus; 08-14-2010 at 01:35 AM.
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Old 08-14-2010, 01:34 AM   #2
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Here's an illustration:

How the roof is currently-



Proposed addition in red -



Proposed final product -


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Old 08-14-2010, 08:36 AM   #3
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How old is the front roof ?
Most likely the shingle colors will not match up
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Old 08-14-2010, 08:53 AM   #4
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the house is late 60s, and if I did all this work I'd probably replace all the shingles for uniformity.I just wanted to know if it would be structurally possible to splice in to the existing trusses and extend the front face, and if so, how it would be done
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Old 08-14-2010, 11:36 AM   #5
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Question about reroofing


That is going to put a lot of weight on the original ridge, I would talk to an engineer on that one. If you get a lot of snow that could be very bad. JMHO
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Old 08-14-2010, 01:24 PM   #6
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Pensacola, Fl. The only snow we've had in the past 15 years was about 1/16 of an inch...which is debatable because most places it melted before it hit the ground
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Old 08-14-2010, 03:22 PM   #7
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Well you can forget about that part of the load. If you will look at your drawing you can see how all the weight of the short rafters, long rafters, decking, and roofing will be directly on top of the original ridge. That is a lot of pressure for a regular roof structure but for trusses that is way too much weight as that will put tremendous pressure on the gussets which are not designed for that extra pressure.
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Old 08-14-2010, 04:08 PM   #8
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Ya that's what I was afraid of. I guess that means if I do anything I'll have to reroof the entire thing. You know of any good publications for DIYers on this kind of thing?
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Old 08-14-2010, 06:00 PM   #9
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Question about reroofing


Quote:
Originally Posted by spydrplus View Post
Ya that's what I was afraid of. I guess that means if I do anything I'll have to reroof the entire thing. You know of any good publications for DIYers on this kind of thing?
What you want to do is not that big of a deal, but it does need to be engineered. Probably need a structural ridge beam.

OTOH, there are numerous low slope roof products as well as tapered insulation to create more slope. Do a search on this site for those terms and you'll be able to look at several more options in addition to the ones you have suggested.
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Old 08-14-2010, 10:30 PM   #10
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Question about reroofing


Something that would be a TON easier to do would be to put a layer of foam on top of the old roof deck... then add a 2x chalnnels for a vent space and a ridge vent over that. Cover that with radient barrier OSB and reshingle.

At this point, your old roofline is a towering 4" above your add on roofline. Now you can re-roof this with standing seam metal, EPDM, or whatever strikes your fancy. You can either have the old roof drip down upon the addition, or you can create a channel out of metal to guide it to the sides to a gutter.

You get some needed radiant barrier and deck insulation Florida Boy, as well as open up some possibilities for that addition.
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Old 08-15-2010, 12:17 AM   #11
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Thanks a million paul and seeyou. I'll start researching all of those suggestions!
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Old 08-15-2010, 10:40 PM   #12
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how wide is that part?whats wrong with gabling that from existing ridge, makes the ridge look like a t from above. unless it is full length of house which is doubtful,
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Old 08-16-2010, 01:51 AM   #13
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It's the full length of the house, so about 60'. I wish it were that easy lol

edit: actually, that is a possibility. Half of the addition is a closed in florida room and the other is an open porch. I could gable both sides with a gap in the middle to make a horseshoe. I plan on adding a bathroom on part of the open porch area. Hmmmmm......
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Old 08-16-2010, 11:47 AM   #14
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I plan on adding a bathroom on part of the open porch area.
Going to plant a bush to tinkle behind?
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Old 08-16-2010, 03:31 PM   #15
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I was planning to close it in, but being that I live in the South I think that's a possibility

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