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bakki
Joined: 27 Sep 2007
Posts: 1
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 Posted: Thu Sep 27, 2007 9:09 am Post subject: Gutter design details for butterfly roof |
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Hi,
I am planning on adding a butterfly roof to a new addition to our house . The house is on a mountain side with a south facing view. The butterfly roof design would give me a taller wall on the view side for more glass area. The roof will be perhaps 1 to 2 in 12 pitch. The other half of this will be over the garage with the valley in between the garage and the house. I am planning on using SIPs for roof panels on glulams. What I'd like is the details on how to design the valley with an integrated gutter.
I'd appreciate any suggestions, pointers to reference materials, gutter fabricators/suppliers etc. Also would like your input on whether the roof should be EPDM covered or standing seam metal.
Thank you very much for your help,
bakki |
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mx2
Joined: 18 Jan 2006
Posts: 1823
Location: Miami, Florida
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| Posted: Mon Oct 01, 2007 7:42 am Post subject: |
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First, the metal or single-ply roofing is an aesthetic call, as they both would work fine for a roofing system in your case. From a design perspective, the issue to me would be the detail of the edge flashing, because that's what people will see "flying" over their heads...I'd go with the metal, in my opinion.
Second, the big question is what is under the central valley-gutter? Is there a wall that runs the length of the gutter or is there a large open space? Can the water just be allowed to discharge here or do you have to have a gutter? Where does the water discharge with the gutter? To one side or both? Will it go to a cistern or landscaping? What is to the east and west of the gutter? What is the structure of the rest of the building? And of course I must ask, why do you want a butterfly roof to begin with?
mx2.5
_________________
*Art of Architecture: The conscious use of skill and creative imagination in the production of an aesthetic building.
*Science of Architecture: The calculated use of technical skill and knowledge in the construction of a functional building. |
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JWmHarmon
Joined: 15 Apr 2004
Posts: 105
Location: Ohio
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| Posted: Sat Oct 06, 2007 4:19 am Post subject: Butterfly roof flashing - leaks |
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One of the major problems with butterfly roofs is the tendency to leak in the valley. You must pay special attention to the waterproofing issue and the drainage from the valley between the two halves of the butterfly.
Water runoff from the longer side of the butterfly wants to run up under the other side, under the roofing material.
Water collecting at the valley, before it can run off to the ends of the valleys, tends to pond sufficiently to leak at the standing seam joints on metal roofs.
Ice buildup (ice dams) can form in the valley causing water to back up and leak at the seams.
Details for flashing for the valley of a butterfly roof must take into consideration the most exteme weather conditions (heavy rainfall, snow depth, ice build-up) that predominate for you area.
Could the building be designed as two separate sections with two separate shed roofs to achieve the same effect for the views?
_________________
When building or manufacturing always ask, "How will we recycle that?" - JWmHarmon |
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