Best Practice Detail For Gutterless Roof Edge

 
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Old 03-18-2010, 11:22 AM   #1
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Best Practice Detail For Gutterless Roof Edge


A GC contributor has been posting some excellent progress photos of a handsome new home being built on or near the Massachusetts coastline.

The roof feature is a gutterless knife-edge, and photos can be seen in the thread "Project Update" in the general Carpentry thread here at CT.

I would like some comments from roofing specialists about this detail, as it is one I want to include in some upcoming house designs.

Thanks.
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Old 03-18-2010, 11:30 AM   #2
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Re: Best Practice Detail For Gutterless Roof Edge


The design asthetically looks great, it does however do nothing to help get rid of the roof water. In order to even consider this detail, the large overhang is a must as is good grading a drainage around the house, GMOD

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Old 03-18-2010, 11:56 AM   #3
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Re: Best Practice Detail For Gutterless Roof Edge


Houses built like that, with their big budgets, always get the perimeter drains they deserve. I am in deep snow country, and practically nothing gets guttered. Most new jobs get golf-ball-sized washed river gravel done as the finish from the building line out to a foot or so past the drip line, with a socked drain tile going into a trench right at the drip line.

Houses I have built with that no-gutter-but-with-proper-drainage detail, have been problem-free.

I've seen a few details for roof edge done by New England architects, in which a single course of wood shingles, applied to the deck first and before felt or membrane, go down to function as the "drip" edge.

What I am wondering is how they hold up over the longer haul, with the possible wicking up and back that can occur.

If you go through the thread I cite in the opening post here, you can see closeup photos of the knife edge detail, and you can see my Sketchup renders of it, along with my hallucination for a similar detail, done using a custom metal drip.

All comments are welcome.
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Old 03-18-2010, 03:04 PM   #4
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Re: Best Practice Detail For Gutterless Roof Edge


Is that you, Gene/Bob?
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Old 03-18-2010, 03:16 PM   #5
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Re: Best Practice Detail For Gutterless Roof Edge


Quote:
Originally Posted by seeyou View Post
Is that you, Gene/Bob?
Yes it is Grant!

Dave
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Old 03-18-2010, 04:13 PM   #6
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Re: Best Practice Detail For Gutterless Roof Edge


Quote:
I've seen a few details for roof edge done by New England architects, in which a single course of wood shingles, applied to the deck first and before felt or membrane, go down to function as the "drip" edge.
I done that detail several times when on an older structure and also on new structures that utilizes older style details.

The problem with the wood shingle detail is over a period of time the wood shingle will tend to get very spongy. water from the edge drips down and some gets sucked up by the cedar, saturating the wood farther up then the amount that is overhanged.

If it were me, I wood lay the cedar on top of the waterproofing membrane of choice and over a small metal edge either L shaped or with a drip edge.. The size and profile of the metal will depend on the wood trim profile.

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