How Metal Flashings Are Used On Your Roofing System
GAF Flashing Installation Guide
Starter metal is designed to protect the gutter edge of your roof. The typical dimension is 1" x 3". Most eave flashings for residential application are 26 gauge painted steel while multi-family often requires 24 gauge. The drip edge helps to keep water off of the plywood so it does not rot the edge of the roof. It also works in conjunction with your rain gutters.
Back Pan or Fireplace metal is designed to be installed behind a chimney or fireplace. These areas are one of the areas that are most susceptible to leaking as rain water flows right to the back of both of those areas. The pan metal runs about 8" up the chimney and 13" into the roof deck to prevent any water that potentially works under the shingles from damaging the roof deck.
Metal valley flashing is exactly what it sounds like. A 26 gauge 24" wide flashing that fits into the valley. It helps to protect one of the most critical lead areas on the roof. It also makes roof maintenance easier as branches and needles easily flow out of the valley. Closed valley methods tend to hold more debris.
Hi Im Don Webster, the founder of Cougar Construction & Roofing. I believes firmly in excellence, and serving my customers with integrity. My passion for serving his customers has prompted me to start this roofing blog to help educate consumer on proper roof etiquette if you will. Hope you enjoy!