Steel Roof Flashing Around Chimney

Chimney pipes on metal roofs must be flashed in order to create a watertight seal around the pipe and prevent leaks through the roof.

Steel roof flashing around chimney.

It s typically made of thin pieces of impenetrable material which inhibits water leaking around the chimney preserving the building from moisture and mold issues. Flashing is installed to surround roof features such as vents chimneys and skylights. A cricket is sloped like a tent roof to deflect water around the chimney. 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.

Base flashing has several components. Square step flashing to fit 1 1 2 in. Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer. Apply sealant to sidewall flashing where pan flashing tabs will overlap.

Around the front corner as shown. Embed the corner step flashing in the caulk and nail it to the roof with two roofing nails. The flashing can be installed quickly and easily with kits that use rubber pipe boots. Snip and bend a piece of prebent 8 in.

Weather and oxidization are the most common culprits for flashing deterioration but it is possible that flashing can just simply come loose. Flashing is often made of metal which is the norm on a metal roof. Rivet the pan flashing to the sidewall flashing. Cut and fold pan flashing to fold up the back of the chimney and over the sidewall trim.

Apply a jelly bean size dollop of caulk at the corner where the chimney meets the roof. Install two layers of butyl tape sealant under perimeter of pan flashing. The material is usually aluminum or galvanized steel and depending on the type of roof you have is most likely in the valleys around the chimney and even around dormer windows or skylights.