Fix Leaking Chimney Flashing

Renew flashing seals by chipping out the old mortar and caulking along the edges of the flashing.

Fix leaking chimney flashing.

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. 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. If the mortar joint is deteriorating the joint will need to be repointed and you may need to have this done professionally.

However if it s an issue with the flashing or shingles you ll want to budget 654 for roof repair costs. Chimney flashing has two parts. 2 many chimney leaks are from cracks in the chimney crown. A base flashing which attaches to the wood decking on the roof and a counter flashing that covers the base.

Apply a generous amount of roofing cement behind the flashing. Code requires a chimney have a cricket if it is thirty inches or wider. Full service chimney often installs crickets on all chimneys since this is where over one half of all chimney leaks are from. The chimney crown is the cement part on top of the chimney.

If the damage and the leak are minor you should be able to replace the chimney flashing just like you would step flashing. Often ponding water will rust a hole in the simple flashing found on most chimneys. Use a chisel to remove any hardened roofing cement. To repair loose roof chimney flashing.

If you find the problem is with the brick or mortar the average cost for masonry repairsis 1 192. Use masonry nails or screws to reattach the flashing tight. Replacing the flashing is expensive. 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.

The first step in your repair is identifying where the leak is coming from then you ll be able to make the appropriate fix. How to fix it. Use special masonry caulk to seal the joints between the flashing and the chimney.