How Much Overhang On Roof Shingles

Anywhere from a 1 2 to a 1 overhang is acceptable as you can tell from the varying comments amongst the previous posters. Roof drip edges are generally sold in 10 5 foot lengths but they are occasionally sold in 8 foot lengths or smaller. A architect and roofing consultant harrison mccampbell responds.

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This profile of drip edge is shaped like a t with a lower flange at the bottom.

How much overhang on roof shingles.

The length of the overhang itself commonly ranges from 2 to 5 inches. In my opinion the felt underlayment should also extend beyond the drip edge by 1 4 to 1 2 inch. The edge of the shingles should hang over the edge of the roof between an inch and an inch and a half or between a half inch and three quarters of an inch if drip edge flashing is installed and in most cases it should be. If you do not have a drip edge flashing installed shingles should overhang an inch to an inch and a half.

Knowledgeable roofers will install shingles at just the right overhang for your roof type. Roof overhangs can extend farther than 2 feet but beyond this length they begin to lose structural integrity and require external supports. Most shingle manufacturers along with the asphalt roofing manufacturers association s residential asphalt roofing manual call for a 1 4 inch to 3 4 inch overhang at both rakes and eaves. If you have installed a drip edge flashing you should have between half an inch and three quarters of an inch of shingle overhang.

Two feet is the general maximum length for a typical roof overhang. In my opinion the shingles should never be exactly even with the edge of any drip edge flashing. This will protect a roof from most types of damage. Each has their own reasoning for a slightly different amount of overhang.

How much overhang should roof shingles have.

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