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.