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. Too much overhang and the shingles could blow off in high winds; too little can allow water to seep into rake or fascia boards.

Should shingles overhang drip edge?

Yes. Shingles should not extend more than 3/4” (19 mm) past the drip edge. If shingles overhang the edge of the roof by more than 3/4” (19 mm), then they are not supported and may crack and break off. In addition, the wind resistance at the roof edge may be compromised.

How much should roof shingles overhang gutter?

Most shingle manufacturers recommend a 1/4 to 3/8 inch overhang over your eave, which is where your roof ends by your gutter. In many cases, and particularly as home ages and settles, the roof edge at the eave edge can wave in and out by more than this amount.