How To Roof Chimney Flashing

Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing.

How to roof chimney flashing.

A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit. If you were not provided with base flashing you can install step flashing up the side of the chimney. Cap flashing mortared or caulked into the chimney laps over the top edges of the other flashings to prevent water from running behind them. Apply roofing cement to the joint between the flashing and brick.

Seal the sides of the chimney with prebent pieces of step flashing under each course of shingles photos 4 and 5. Roof decks and chimney move independently as they are heated by the sun. Place a second piece of 8 inch 20 3 cm flashing against the chimney. Hammer 2 roofing nails into the flashing and roof.

Use masonry nails or screws to reattach the flashing tight against the chimney. Place a small drop of caulk where the roof and chimney meet at the chimney corner. Cover any exposed nail or screw heads with roofing cement. Flashing is often made of metal which is the norm on a metal roof.

Seal the seam between the cap and step flashing with urethane roofing cement or silicone caulking compound as shown at right. Continuous flashing protects the joint between a vertical wall and a sloped roof. 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. Use special masonry caulk to seal the joints between the flashing and the chimney.

Slide the prebent and soldered chimney saddle into place behind the chimney. Galvanized roofing nails about every 6 in. Along the edges or closer if necessary to flatten the metal. Apply a generous amount of roofing cement behind the flashing.

They re applied under roofing felt along eaves and over roofing felt along rakes. Drip edges prevent water from seeping under roofing along the edges of rakes and eaves. The roof deck and the brick chimney are physically separated by the chase. With the primary flashing and counter flashing connected this differential movement could potentially allow strain to develop in the mortar or pull at fasteners in the roofing assembly.

Place the step flashing over the caulk and onto the chimney. Secure a shingle over the corner flashing using a hammer and roofing nail.