Metal Roof Flashing Diagram

A diagram and helpful explanation on how chimney flashing step flashing and other types of roof flashing protect a roof from leaks.

Metal roof flashing diagram.

The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide. Flashing provides the extra protection these spots need. Open valleys have metal flashing to protect this critical area of the roof. Most flashing is made of galvanized metal but diy ers may prefer aluminum flashing because it s easier to bend.

At the end of the vertical sidewall the step flashing shall be turned out in a manner that directs water away from the wall and onto the roof and or gutter while this is a nice diagram of how these flashings work don t forget our 5 th design rule. The most common flashing for metal roofing is the ridge cap which is used at the peak of a roof where two opposing roof slopes join. Other flashings include transition flashing end wall and sidewall flashings and valleys see diagram on right for application. The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak.

These problem areas include the edges of skylights and chimneys soil stacks vent fans and roof valleys as well as the intersection of the roof deck and dormer walls.