How far should shingles hang over the drip edge of the roof?

Question

Is it normal for asphalt shingles to hang past the drip edge a couple of inches on the rakes of the roof?

Answer 1

It may depend on the specific brand and version of the shingles used. Here is an advisory from GAF a major manufacturer:

GAF Shingle Advisory

In it they say:

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.

Here is another manufacturer's information from:

Owens Corning Installation

Which says:

Asphalt shingles should overhang the exterior edge of the drip edge by ¼ to ¾-inch.

Answer 2

I just had my roof done and they hung them over about 1.5 inches and the installer said they trained us to extend them to reduce ice getting under them in Snow and ice areas In the Northeast