How To Fix Roof Flashing Around Chimney

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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. Apply a generous amount of roofing cement behind the flashing. Leaks around fireplace chimneys are common and can be hard to identify the source. Clean any leaves or other debris out of the gap between the flashing and chimney.

Use a chisel to remove any hardened roofing cement. Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing. It is attached to one side of the chimney and one side on the roof. Set the flashing aside.

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. Place the step flashing over the caulk and onto the chimney. Bend the corner flashing tightly around the corner. To repair loose roof chimney flashing.

Use masonry nails or screws to reattach the flashing tight. Applying roofing cement to gaps between metal 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. Seal the seam between the cap and step flashing with urethane roofing cement or silicone caulking compound as shown at right.

Use special masonry caulk to seal the joints between the flashing and the chimney. Hammer 2 roofing nails into the flashing and roof. The only way to repair flashing is to replace it. Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in.

Fit an 8 inch 20 3 cm piece of square step flashing over the chimney s front corner. 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. Step flashing on roof peak. Pound the flashing into the grooves and fasten with the drive in expanding anchors.

Chimney flashing is usually found under the shingles at a 90 degree angle.