How Much Overhang For Roof Shingles

How much overhang should roof shingles have.

How much overhang for roof shingles.

Knowledgeable roofers will install shingles at just the right overhang for your roof type. 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. The length of the overhang itself commonly ranges from 2 to 5 inches. Ed the roofer if what you say about fixing the problem cutting the edge is the proper way to do it than i m not terribly upset.

If you have installed a drip edge flashing you should have between half an inch and three quarters of an inch of shingle overhang. The edge of the shingles should hang over a 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. To lay out the design for the shingles begin at the bottom of the roof and place a tape measure inch from the edge of the roof to ensure the shingles overhang the drip edge. Mark 12 inches up on the roof for the first course of shingles then mark every 5 inches all the way up the roof to set your reveal.

Roof drip edges are generally sold in 10 5 foot lengths but they are occasionally sold in 8 foot lengths or smaller. Too little can allow water to seep into rake or fascia boards. The 3 4 overhang of the shingle creates a full 1 overhang from the fascia to the edge of the shingle. Too much overhang and the shingles could blow off in high winds.

I was worried that because the edge shingle is the bottom layer fixing this would require redoing it. If you do not have a drip edge flashing installed shingles should overhang an inch to an inch and a half. Do this on both sides of the roof. In my opinion the felt underlayment should also extend beyond the drip edge by 1 4 to 1 2 inch.