Fix Leaking Chimney Flashing

Often ponding water will rust a hole in the simple flashing found on most chimneys.

Fix leaking chimney flashing.

Chimney flashing has two parts. The chimney crown is the cement part on top of the chimney. Use special masonry caulk to seal the joints between the flashing and the chimney. The first step in your repair is identifying where the leak is coming from then you ll be able to make the appropriate fix.

The bricks go up around the tile flue liners but at the top you need something to stop the rain and snow from just falling in around the tiles. Use a chisel to remove any hardened roofing cement. How to fix it. To repair loose roof chimney flashing.

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. If the damage and the leak are minor you should be able to replace the chimney flashing just like you would step flashing. Get a chimney cover and have a professional make sure it s not this simple.

Seal the seam between the cap and step flashing with urethane roofing cement or silicone caulking compound as shown at right. Chimney flashing repairs are done around the chimney area. To repair your flashing with flashseal you first need to clean the area of any dirt and debris to allow the product to work as efficiently as possible. Code requires a chimney have a cricket if it is thirty inches or wider.

After the clean area dries apply a thin base coat of flashseal that covers the entire flashing area and extends a few inches above the flashing line. Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing. Full service chimney often installs crickets on all chimneys since this is where over one half of all chimney leaks are from. However if it s an issue with the flashing or shingles you ll want to budget 654 for roof repair costs.

2 many chimney leaks are from cracks in the chimney crown. If the mortar joint is deteriorating the joint will need to be repointed and you may need to have this done professionally. If you find the problem is with the brick or mortar the average cost for masonry repairsis 1 192.