How To Fix Roof Flashing Around Chimney

Chimney roof leaks are usually caused by gaps or cracks between the metal flashing used to join the chimney to the roof and the chimney.

How to fix roof flashing around chimney.

Step flashing on roof peak. Fit an 8 inch 20 3 cm piece of square step flashing over the chimney s front corner. Before going up on the roof to do the replacement it is recommended that measurements are taken around the chimney so that the flashing can be ordered. Leaks around fireplace chimneys are common and can be hard to identify the source.

Hammer 2 roofing nails into the flashing and roof. Set the flashing aside. Use a chisel to remove any hardened roofing cement. Use special masonry caulk to seal the joints between the flashing and the chimney.

Bend a piece of cap flashing to fit around the top corner of the chimney and add the cap flashing across the back of the chimney. Http amzn to 2cjy6ev get the reinforcement fabric here. Seal the seam between the cap and step flashing with urethane roofing cement or silicone caulking compound as shown at right. Http amzn to 2ajekf4 visit us at.

Bend the corner flashing tightly around the corner. Pound the flashing into the grooves and fasten with the drive in expanding anchors. Apply a generous amount of roofing cement behind the flashing. If you do not wish to form your own corner flashing you can buy pre bent pieces and cut them to size or use a piece of corrugated aluminum which is easier to bend.

Chimney flashing is usually found under the shingles at a 90 degree angle. Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in. Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing. Applying roofing cement to gaps between metal flashing and the chimney.

Roof shingle over step flashing. Place the step flashing over the caulk and onto the chimney. Use masonry nails or screws to reattach the flashing tight. Clean any leaves or other debris out of the gap between the flashing and chimney.

Place a small drop of caulk where the roof and chimney meet at the chimney corner.