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.