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Old 10-10-2018, 11:08 PM   #1
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connecting sunroom gable roof or shed roof


I have a roof bump up area (see pic), I need to join a gable roof to this but the bump up area is more narrow than the room width (gable width) looking for framing suggestions.
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Old 10-11-2018, 05:50 AM   #2
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Re: connecting sunroom gable roof or shed roof


Where the new roof meets the old, you will have a valley. At the valley, you will need a base plate for the rafters to sit on. At the lower plane, you can double the plate. Or shim with thin ply to make up the difference. It does look like you want to remove the shingles so you can see what you're dealing with. Example, for framing, you want to know where the rafters are, if they are framed to take the new roof load. The bump could be severely water damaged as well.
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Old 10-11-2018, 09:03 AM   #3
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Re: connecting sunroom gable roof or shed roof


I had actually exposed the underside of these rafters (inside) when I made a vaulted ceiling so I know theyre good. Just a quick follow up though if I double up the plates on the lower part of the bump up wont it make the ramp (plywood slope) different for that area ?

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Where the new roof meets the old, you will have a valley. At the valley, you will need a base plate for the rafters to sit on. At the lower plane, you can double the plate. Or shim with thin ply to make up the difference. It does look like you want to remove the shingles so you can see what you're dealing with. Example, for framing, you want to know where the rafters are, if they are framed to take the new roof load. The bump could be severely water damaged as well.
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Old 10-11-2018, 09:49 AM   #4
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Re: connecting sunroom gable roof or shed roof


Why is that bump even there?
It makes the whole roof look odd.
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Old 10-11-2018, 10:20 AM   #5
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Re: connecting sunroom gable roof or shed roof


I agree, The area that I want to attach sunroom is actually bumped back from the house about 2 feet so I think when the house was built instead of doing a shed roof from the originally pitch point they pulled the rafters out the extra 2 feet which made for weird little bump ups on top of the roof that now have to be flashed.

I had considered just building out each side to widen the bump out so the new gable would lay flat, only problem with that is I will get a flashing issue around the chimney

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Why is that bump even there?
It makes the whole roof look odd.
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Old 10-11-2018, 11:32 AM   #6
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Re: connecting sunroom gable roof or shed roof


I wonder if something like this would work guys ? .
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Last edited by Gregsoldtruck79; 10-11-2018 at 06:07 PM.
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Old 10-11-2018, 11:59 AM   #7
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Re: connecting sunroom gable roof or shed roof


Are you saying to extend the bump up just in the area where the gable roof will tie in ? The weird thing is the bump up is a different height, nearly 7 inches on one side and 4 on the other so I'm worried it wont look consistent. I dont know what the original framers were thinking I'm trying to do it so it doesnt look hodge podge

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I wonder if something like this would work guys ? .
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Old 10-11-2018, 12:54 PM   #8
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Re: connecting sunroom gable roof or shed roof


Well, we all know the best thing to do is get rid of the "bump" but that may not be in the pot...


You mean its tapered from the top of the ridge of the house down to the soffit ?
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Last edited by Gregsoldtruck79; 10-11-2018 at 06:07 PM.
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Old 10-11-2018, 01:06 PM   #9
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Yes its tapered down all the way from ridge, i cant get rid of it sadly because the rafters run all the way ti the bumped out portion of back wall so they are at a slighly different pitch
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Old 10-11-2018, 01:15 PM   #10
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Re: connecting sunroom gable roof or shed roof


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Yes its tapered down all the way from ridge, i cant get rid of it sadly because the rafters run all the way ti the bumped out portion of back wall so they are at a slighly different pitch



Gezzz, I was envisioning it was only raised around 4.5 inches max and the "bump up" being parallel with the roof under it, all the way down the roof. It so, my little "kickout" in my sketch "maybe" would not have been too noticeable.

But with a 7- 8 inch rise of the bump at the soffit/gutter along with a new gable roof sitting on it, and then the non "parallel -ness " of it all going up the two roof lines, wow, it will really be noticeable to anyone with construction knowledge.

So sorry, my idea is of no help here. Good Luck on your project.
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Old 10-11-2018, 01:37 PM   #11
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Thanks very much though for input, house was built in 1938, not real certain what was in the water that year
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Old 10-11-2018, 04:30 PM   #12
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Re: connecting sunroom gable roof or shed roof


No matter what you do it's gonna look a little awkward. Only way for it to match up would be to widen the bumper to the new roof width.

You could also do small 'flat' roofs at the bottom, until the valley would be even with the bumpout.
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Old 10-11-2018, 04:37 PM   #13
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I had thought about a flat roof but worried about snowload,,probably going to widen the bump up. Thanks for reply, i think either way will be a bit off looking
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Old 10-12-2018, 05:30 AM   #14
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Re: connecting sunroom gable roof or shed roof


For the gable roof to look good, it must be framed level, plumb and each side equal to eachother. Maybe what you can do is find your ridge and string a level line and rafter lines. Forget about what's above for now. Use sticks nailed to the facia or whatnot so you can fasten and hold the strings. That should begin to show you what parts need to be filled in for the framing. Rest of the lopsided framing above, not sure, but maybe some of that can be hidden under more flashing?


Another idea maybe a cricket where the ridge starts? Or start your ridge and rafters, ignore the bump, then add cricket?

Last edited by carpdad; 10-12-2018 at 05:37 AM.
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Old 10-12-2018, 09:13 AM   #15
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Re: connecting sunroom gable roof or shed roof


I was thinking I would climb up on the roof and snap a pic of that valley area near the chimney, I think the only way to make this look nice is to widen those bump "up" on each side so they line with the bump "out" on the rear of the house. I'll update with a pic later

Quote:
Originally Posted by carpdad View Post
For the gable roof to look good, it must be framed level, plumb and each side equal to eachother. Maybe what you can do is find your ridge and string a level line and rafter lines. Forget about what's above for now. Use sticks nailed to the facia or whatnot so you can fasten and hold the strings. That should begin to show you what parts need to be filled in for the framing. Rest of the lopsided framing above, not sure, but maybe some of that can be hidden under more flashing?


Another idea maybe a cricket where the ridge starts? Or start your ridge and rafters, ignore the bump, then add cricket?
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