What is Style D Roof Edge?
Style D, also known as “DL,” “drip edge” or “eave drip,” is a type of roof flashing, applied to the edge of a roof prior to shingling. It’s shaped more like a “T” than a “D”—but that’s construction terminology for you. One arm of the “T” extends a couple inches onto the roof, the other arm extends about 1 inch beyond the roof and the lower leg extends about 1 inch down onto the fascia. It performs a variety of functions: It helps protect the edges of exposed plywood and OSB sheathings, it creates a clean edge for supporting the edges of shingles and it helps deflect water away from eave boards and/or into gutters. (Water can easily run 1 inch uphill—Style D prevents that.)
Style D roof edge is usually sold in 10-foot lengths, is available in steel, aluminum and vinyl, and can commonly be found in metallic, white, brown and tan.