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Certainteed Shingle Applicator's Manual, 9th edition, page 93, Chapter 10 - Three-Tab Shingles:

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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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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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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