How To Roof Chimney Flashing

Place the step flashing over the caulk and onto the chimney.

How to roof chimney flashing.

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

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. 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.

The roof deck and the brick chimney are physically separated by the chase. 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. Nail it to the roof along the top edge.

Continuous flashing protects the joint between a vertical wall and a sloped roof. Drip edges prevent water from seeping under roofing along the edges of rakes and eaves. Ensure the chimney s base flashing is in proper order secured to the roof as the manufacturer or mason recommends beneath the shingles. Secure a shingle over the corner flashing using a hammer and roofing nail.

If you were not provided with base flashing you can install step flashing up the side of the chimney. Seal the sides of the chimney with prebent pieces of step flashing under each course of shingles photos 4 and 5. Slide the prebent and soldered chimney saddle into place behind the chimney. Seal the seam between the cap and step flashing with urethane roofing cement or silicone caulking compound as shown at right.

Galvanized roofing nails about every 6 in. Along the edges or closer if necessary to flatten the metal. Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing. Apply roofing cement to the joint between the flashing and brick.

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. Apply a generous amount of roofing cement behind the flashing.