Flashing A Masonry Chimney On A Metal Roof

Fold closure 90 degrees and.

Flashing a masonry chimney on a metal roof.

Panels above the chimney should be removed. 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. Some chimneys are clad in wood stucco or aluminum siding. Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in.

Counter flashing is placed over the step flashing parallel to the chimney. Any such leaks can be quite frustrating to diagnose. 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. Bend legs up the chimney sides about 1 inch.

Base flashing has several components. Round metal chimneys will be flashed much like pipes. 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. Pound the flashing into the grooves and fasten with the drive in expanding anchors.

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. 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. Chimney flashing can allow roof leaks in the transition area between the chimney and the roofing materials.

Cut two opposing 45 degree notches into z closure to allow a 90 degree bend. A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit. Is it a roofing problem or is the leak caused by deteriorated brick or mortar or faulty counter flashing embedded in the masonry. Apply butyl tape to the underside of the closure.

If the systems are a masonry chimney the counter flashing should be ground into the system to ensure that the majority of the water cannot bypass the seam of the counter and step flashing. Chimney flashing is actually a two part affair. 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. Typically chimney flashings are more complex than other types of roof flashings and are a common source of roof leaks.