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Old 02-22-2012, 09:04 PM   #1
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Intersecting gambrel roofs


I am building an addition to my existing workshop. The smaller existing roof will meet the bigger new roof at the lower part of the gambrel roof. This results in rather sharp angles for the valleys. The question is how to properly install the 3 tab shingles at the valleys including the underlayment and flashing.

Thanks,
Egbert




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Old 02-22-2012, 09:21 PM   #2
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Intersecting gambrel roofs


Just another roof.
You can weave any valley, or lay one roof over the other.
Run paper past valleys like always.
I admit it's going to get pretty weird up there.
You're making this pretty tough on yourself, this design.


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Old 02-23-2012, 09:19 AM   #3
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Intersecting gambrel roofs


+1

That is going to be a funky tie in.

Use Ice/Water shield as a minimum in that valley.
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Old 02-23-2012, 09:29 AM   #4
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Intersecting gambrel roofs


Next to imposable to tie it in the way your trying to do it.
That wall should have been set so it was connected to the shed that's there now forming an inside corner, not away from it leaving a gap.
That way some of your trusses could have been cut where the two roofs meet so they would be sitting on the old sheds roof.
The way you have it now one side of your gable roof is going to look differant from the the other side.
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Old 02-23-2012, 09:46 AM   #5
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Intersecting gambrel roofs


What type of foundation are these sheds on?
The same? - different?

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Old 02-23-2012, 09:51 AM   #6
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Intersecting gambrel roofs


Good point, I guessing where your getting at, correct me if I'm wrong.
If the old sheds just on skids the two building are going to be moving slightly differant rates and can cause the two roof lines to crack where they intersect.
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Old 02-23-2012, 10:00 AM   #7
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Intersecting gambrel roofs


"joecaption"

Yeah, my thoughts exactly!
(Great minds think alike!!)
"W-on-W" is on - what do you think?
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Old 02-23-2012, 10:02 AM   #8
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Intersecting gambrel roofs


Wo WO I got one right, yea. lol
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Old 02-23-2012, 10:07 AM   #9
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Intersecting gambrel roofs


Every "Dog" has it's day!
(From a "Dog")

RF
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Old 02-23-2012, 11:32 AM   #10
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Intersecting gambrel roofs


Quote:
Originally Posted by rossfingal View Post
"joecaption"

Yeah, my thoughts exactly!
(Great minds think alike!!)
"W-on-W" is on - what do you think?
I would tend to agree with joe ( ) in that you need to cut some structure to have it terminate on the old roof.
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Old 02-23-2012, 12:11 PM   #11
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Intersecting gambrel roofs


From the picture - it looks like there is a space between the existing shed,
and the new shed. (Looks to be a foot or two)
How is that gap going to be "bridged" on the roof; and, the walls?
As usual - the "OP" has not gotten back!

Two separate structures - moving independently?!?
The way it looks - the roof on the existing structure (and the walls) are going to have to be
run into the new structure.
Roof - old roof, extended and "set-on" the new roof.
Easy!

RF

Last edited by rossfingal; 02-23-2012 at 12:16 PM.
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Old 02-23-2012, 06:42 PM   #12
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Intersecting gambrel roofs


Wow, thanks for the responses. As for the existing shed, yes it is on skids. At the corners where both building meet they do share common footing piers. I didn't had a current picture since I keep everything covered with tarps to deal with the rain every other day. Here is one from today.



I do have the roofs tied in with each other and the gap that was visible is bridged by extending the wall and roof of the existing shed. Today the building inspector approved the framing.

My main question is how to shingle the valleys. I plan on using Ice/Water shield at the area where both roofs connect and at the break of the pitch on both roofs. My concern is at the lower parts of the valleys the angle is close to 90 degrees and running the shingles onto the other roof plane might be too much of a bend.

Thanks,
Egbert
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Old 02-23-2012, 06:56 PM   #13
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Intersecting gambrel roofs


The shingles do not get bent, only the flashing and tar paper get bent. The shingles would be done as if they were two seperate roofs and just get cut where they meet The angles way to steep to do a woven valley. You need a cut valley.
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Old 02-23-2012, 07:03 PM   #14
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Intersecting gambrel roofs


Quote:
Originally Posted by joecaption
The shingles do not get bent, only the flashing and tar paper get bent. The shingles would be done as if they were two seperate roofs and just get cut where they meet The angles way to steep to do a woven valley. You need a cut valley.
True.
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Old 02-23-2012, 09:43 PM   #15
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Intersecting gambrel roofs


You need "step flashing" -
Hope you can find some matching siding!

RF

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