How To Roof Chimney Flashing

Place a second piece of 8 inch 20 3 cm flashing against the chimney.

How to roof chimney flashing.

Drip edges prevent water from seeping under roofing along the edges of rakes and eaves. Flashing is a method of weatherproofing the base of a chimney. 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. Cap flashing mortared or caulked into the chimney laps over the top edges of the other flashings to prevent water from running behind them.

They re applied under roofing felt along eaves and over roofing felt along rakes. Place a small drop of caulk where the roof and chimney meet at the chimney corner. 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.

Nail it to the roof along the top edge. The roof deck and the brick chimney are physically separated by the chase. 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 often made of metal which is the norm on a metal roof.

Ensure the chimney s base flashing is in proper order secured to the roof as the manufacturer or mason recommends beneath the shingles. Apply roofing cement to the joint between the flashing and brick. Use masonry nails or screws to reattach the flashing tight against the chimney. Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing.

Seal the seam between the cap and step flashing with urethane roofing cement or silicone caulking compound as shown at right. Place the step flashing over the caulk and onto the chimney. Galvanized roofing nails about every 6 in. Continuous flashing protects the joint between a vertical wall and a sloped roof.

Along the edges or closer if necessary to flatten the metal. Secure a shingle over the corner flashing using a hammer and roofing nail. Hammer 2 roofing nails into the flashing and roof. A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit.

Seal the sides of the chimney with prebent pieces of step flashing under each course of shingles photos 4 and 5. Apply a generous amount of roofing cement behind the flashing.