How To Roof Chimney Flashing

Apply roofing cement to the joint between the flashing and brick.

How to roof chimney flashing.

Cover any exposed nail or screw heads with roofing cement. Cap flashing mortared or caulked into the chimney laps over the top edges of the other flashings to prevent water from running behind them. Seal the sides of the chimney with prebent pieces of step flashing under each course of shingles photos 4 and 5. Place a second piece of 8 inch 20 3 cm flashing against the chimney.

Apply a generous amount of roofing cement behind the flashing. Slide the prebent and soldered chimney saddle into place behind the chimney. Roof decks and chimney move independently as they are heated by the sun. Flashing is often made of metal which is the norm on a metal roof.

Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing. Galvanized roofing nails about every 6 in. Secure a shingle over the corner flashing using a hammer and roofing nail. Drip edges prevent water from seeping under roofing along the edges of rakes and eaves.

Place the step flashing over the caulk and onto the chimney. Ensure the chimney s base flashing is in proper order secured to the roof as the manufacturer or mason recommends beneath the shingles. Use special masonry caulk to seal the joints between the flashing and the 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.

Place a small drop of caulk where the roof and chimney meet at the chimney corner. 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. If you were not provided with base flashing you can install step flashing up the side of the chimney. Along the edges or closer if necessary to flatten the metal.

The roof deck and the brick chimney are physically separated by the chase. Hammer 2 roofing nails into the flashing and roof. Nail it to the roof along the top edge. Use masonry nails or screws to reattach the flashing tight against the chimney.

A do it yourself video detailing step by step how to flash a chimney with our metal roofing chimney kit. Continuous flashing protects the joint between a vertical wall and a sloped roof.