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Q.Most of the houses we build have 12/12 roofs with plumb fascias. Even though our roofer uses drip-edge, water still sometimes drools down the fascias. What are we doing wrong?

A.Architect and roofing consultant Harrison McCampbell responds: Standard drip-edge profiles include a turned-out bottom lip that directs water away from the fascia. The distance from the end of this lip to the face of the fascia varies, depending on the manufacturer and the style of the drip-edge you are using, from as little as 1/4 inch to as much as 1 inch.

Most drip-edge profiles are successful at directing water away from the fascia during periods of heavy rain. During drizzly weather, though, rainwater is sometimes able to curl under a drip-edge and run down the fascia, especially if the drip-edge has a short lip. One manufacturer selling a drip-edge with an aggressive lip is Lamb & Ritchie of Saugus, Mass. (781/941-2700). Its Positive Rite Flow drip-edge has a lip that projects 1 inch from the fascia. It’s available in 30-gauge galvanized, white galvanized, and brown galvanized steel; 26-gauge mill-finish; white and brown aluminum; and 16-ounce copper.

Rite Flow Drip-Edge