Roof Flashing Around Chimney

The first is called step flashing.

Roof flashing around chimney.

Rivet the pan flashing to the sidewall flashing. Bend a piece of cap flashing to fit around the top corner of the chimney and add the cap flashing across the back of the chimney. In most cases it is essential to use a skilled craftsman to wrap a layer of the rubber material into a step flashing and then counter flash with aluminum or copper. Use tin snips to clip the flashing at the point where the other side of the chimney lies against the flashing.

In the second layer more sheet metal is inserted into the chimney mortar joints and folded over to cover the first layer. Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in. It is a time consuming process. Sections of l shaped sheet metal are woven into the shingle courses and lapped up the side of the chimney.

The bent edge should fit around 1 corner of the chimney. Pound the flashing into the grooves and fasten with the drive in expanding anchors. The part of the flashing that lies flush with the roof should overlap the roofing shingles. Effective roof flashing around a chimney includes two layers.

A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit. Flashing the area of a chimney with a rubber roof system is very tricky. The l shaped flashing that protects the joint between a roof and a chimney can sometimes pull away from the chimney especially if it s only held in place by roofing cement. Damaged or improperly installed roof flashing especially around the chimney or dormer is one of the most common causes of roof leaks.

Cut and fold pan flashing to fold up the back of the chimney and over the sidewall trim. And more often than not the culprit is the flashing the sheet metal that keeps the intersection between the chimney and roof watertight. One laying involves tightly playing sheet metal around the chimney edges. Pan flashing should extend at least 12 inches up the roof plane.

According to the federal emergency management agency fema improper roof flashing could lead to wood rot and even deck collapse. Fit the flashing up against the front of the chimney.