- Q.How far beyond the drip-edge
should an asphalt shingle extend? Is the amount of
overhang the same at the rake as at the eave?
A.Architect and roofing
consultant Harrison McCampbell responds: 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. In my opinion, the felt underlayment
should also extend beyond the drip-edge (by 1/4 to
1/2 inch). Don’t overdo the overhang
— shingles that extend more than 3/4 inch
can eventually bend and fracture, leaving the roof
sheathing and fascia vulnerable to water
damage.