Flashing A Masonry Chimney On A Metal Roof

Fold closure 90 degrees and.

Flashing a masonry chimney on a metal roof.

Each leg should be about 6 in. Any such leaks can be quite frustrating to diagnose. A continuous sheet metal apron across the chimney s downslope face l shaped step flashing running up both sides and when the chimney sits below the roof ridge a cricket or saddle running across the upslope face. Once you ve cut all your bed joints cut your flashing from roofing grade galvanized sheet metal or copper.

A cricket is sloped like a tent roof to deflect water around the chimney. Some chimneys are clad in wood stucco or aluminum siding. Panels above the chimney should be removed. Is it a roofing problem or is the leak caused by deteriorated brick or mortar or faulty counter flashing embedded in the masonry.

A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit. Trim panels to fit around the chimney. 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. Round metal chimneys will be flashed much like pipes.

Chimney flashing can allow roof leaks in the transition area between the chimney and the roofing materials. Although flashings should be watertight to prevent leaking into the roof and attic they also need to move a bit to accommodate slight shifting of the roof around the chimney stack. Flashings on a chimney are simply the pieces of material usually a metal like copper steel or lead that anchor and seal the chimney to the roof. Counter flashing is placed over the step flashing parallel to the chimney.

The first part is a one piece pan that is bent at a right angle and laid with one leg against the chimney and the other on the roof. Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in. Cut two opposing 45 degree notches into z closure to allow a 90 degree bend. Chimney flashing is actually a two part affair.

Typically chimney flashings are more complex than other types of roof flashings and are a common source of roof leaks. As a rule chimneys are either masonry or metal. Apply butyl tape to the underside of the closure. Pound the flashing into the grooves and fasten with the drive in expanding anchors.