How To Flash A Metal Chimney With Metal Roof

Fold closure 90 degrees and.

How to flash a metal chimney with metal 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. As the side base flashing approaches the valley flashing it will have to be shaped to lie in the lower trough section of the roofing so that the second sheet of roofing will lie flat. Use metal screws or nails to hold the overlaps together then apply caulking material on the seams to seal them off. Cut two opposing 45 degree notches into z closure to allow a 90 degree bend.

If you install a number of flashing segments you need to overlap these segments at about 4 to 6 inches from the previous sheet to prevent gaps. Base flashing has several components. Apply butyl tape to the underside of the closure. Bend legs up the chimney sides about 1 inch.

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