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Overhang

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[#1] Posted: 05/06/2012 - 02:58:28 AM
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I'm pretty sure the normal overhang is 3/4 to 1 inch. Does anyone have that on paper?



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Darren
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Overhang
[#2] Posted: 05/06/2012 - 07:19:58 AM
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Certainteed Shingle Applicator's Manual, 9th edition, page 93, Chapter 10 - Three-Tab Shingles:
Quote: Make sure there is 1/2" left overhanging both rake and eaves if drip edge is being used. If you are not using drip edge, make the overhand 3/4".


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Overhang
[#3] Posted: 05/06/2012 - 09:20:59 AM
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At least it's a straight edge. I wouldn't make a big deal about it.

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Overhang
[#4] Posted: 05/06/2012 - 09:49:30 AM
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NAHB Residential Construction Performance Guidelines states 3/4-inch. Most manufacturer's instructions I see specify no greater than 3/4 inch beyond support.

I think your answer is 3/4 inch.

Not to get off-topic, but around here maybe - maybe - one roofer in a thousand installs drip edge at the eaves and it's normal to find the roof extending an inch to an inch and a half at the rake and anything from about an inch to three inches at the eaves.

This is a typical "drip edge" here. How would you like to be the poor sap trying to clean that gutter without damaging that bottom course?



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Overhang
[#5] Posted: 05/06/2012 - 3:55:21 PM
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Quote: Originally posted by John Kogel

At least it's a straight edge. I wouldn't make a big deal about it.

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I'd at least make it a small deal. Under the weight of ice & snow, those will probably bend over and at least crack.

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Overhang
[#6] Posted: 05/06/2012 - 5:05:33 PM
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To be honest, this particular roof was about 3 weeks old. I'm more concerned about wind uplift and tearing the shingles off.
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Overhang
[#7] Posted: 05/06/2012 - 6:33:57 PM
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Quote: Originally posted by Jerry Simon

Quote: Originally posted by John Kogel

At least it's a straight edge. I wouldn't make a big deal about it.

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I'd at least make it a small deal. Under the weight of ice & snow, those will probably bend over and at least crack.
I did say trim the edge in my pic. I was talking about Darren's overhang.

Snap a chalkline. Use an old fine tooth Skilsaw blade, running backwards. Done.

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Overhang
[#8] Posted: 05/09/2012 - 10:10:59 PM
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Owens Corning provided me with a letter so I would have a backup:

Download Attachment: DRIPEDGE_OVERHANG2[1].pdf
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Hank Spinnler, ACI
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Overhang
[#9] Posted: 05/09/2012 - 10:45:43 PM
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Mel is the head of Building Science & Technoligy?
Bill Kibbel, Historic & Commercial Building Inspections - Old House Resources
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Overhang
[#10] Posted: 05/10/2012 - 12:05:20 AM
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Quote: Originally posted by Darren

I'm pretty sure the normal overhang is 3/4 to 1 inch. Does anyone have that on paper?



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I sometimes see wind damaged shingles when there's excessive overhang like that. Especially on the gable ends like in that picture.

John Dirks Jr - Arundel Home Inspection LLC - MD license: 29827
Maryland Home Inspectors - Maryland Home Inspection - Maryland Radon Testing - Baltimore County Rental Inspection
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Overhang
[#11] Posted: 05/10/2012 - 03:11:17 AM
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Thanks Hank!
Darren
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Overhang
[#12] Posted: 05/10/2012 - 06:54:48 AM
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Quote: Originally posted by Bill Kibbel

Mel is the head of Building Science & Technoligy?
His assistant is cute but she can't spell.

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