Flashing A Masonry Chimney On A Metal Roof

Apply butyl tape to the underside of the closure.

Flashing a masonry chimney on a metal roof.

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. Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in. As a rule chimneys are either masonry or metal. Each leg should be about 6 in.

Base flashing has several components. A cricket is sloped like a tent roof to deflect water around the chimney. Panels above the chimney should be removed. 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.

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. Counter flashing is placed over the step flashing parallel to 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. Once you ve cut all your bed joints cut your flashing from roofing grade galvanized sheet metal or copper.

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 legs up the chimney sides about 1 inch. Pound the flashing into the grooves and fasten with the drive in expanding anchors.

Any such leaks can be quite frustrating to diagnose. Chimney flashing is actually a two part affair. Chimney flashing can allow roof leaks in the transition area between the chimney and the roofing materials. Is it a roofing problem or is the leak caused by deteriorated brick or mortar or faulty counter flashing embedded in the masonry.

Some chimneys are clad in wood stucco or aluminum siding. 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. 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. Fold closure 90 degrees and.