Overhang

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Old 03-30-14, 05:39 AM
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Overhang

I'm finding instructions that say to install starter shingles (bottom edges of roof and rake) with a 1/4 - 1/2 inch overhang beyond the edge. What is the purpose of this and does it get trimmed off later? If not, isn't it vulnerable to damage?
 
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Old 03-30-14, 05:41 AM
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It serves as an extension of the shingles to help prevent capillary movement of water.
 
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Old 03-30-14, 06:12 AM
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and no, it doesn't get trimmed off later.
 
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Old 03-30-14, 07:00 AM
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So the shingles that go over the starters - they go out the same distance?
 
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Old 03-30-14, 08:09 AM
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Simple answer is yes.
I've never installed shingle that that small an over hang.
If there's gutters I've gone as much as 1" so the water does not run down behind the gutters.
1/4" is not enough.
If you ran those shingles even with the fascia's there going to cause them to rot out.
The starter strip should be cut in half and installed so the adhesive strip is at the bottom so the next row will not lift up.
It also needs to be cut on the end so the next row of shingles will overlap the butt joints.
The shingles also must over hang on the rakes.
 
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Old 03-30-14, 09:01 AM
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Joe pretty much covered it. When I shingle I will usually let the starter hang over the gutter apron 1/4-1/2" and then let the shingle hang 1/4-1/2" over that. On gable ends, letting the shingle hang 1/4-1/2" is good. I prefer it to be closer to 1/4" because if you happen to lean a ladder against it, a ladder would crush the shingle if it sticks out more than 1/4" or so. But that's just me.
 
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Old 04-19-14, 06:41 AM
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I'm finding painted aluminum drip edge at Lowes with a profile that extends out from the roof surface then angles back toward the fascia. It looks like it will provide a built-in overhang.

Shop Union Corrugating Galvanized Steel Drip Edge at Lowes.com

Should I use this stuff and if so should the shingles extend past the drip edge angle, or only out to it?
 
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