Chimney Siding Flashing

Improper siding and flashing details can lead to siding failure even with hardie plank.

Chimney siding flashing.

Metal flashing materials are used as transition pieces between the roof and chimney structures. And more often than not the culprit is the flashing the sheet metal that keeps the intersection between the chimney and roof watertight. Copper is one of the best metal materials to use for exterior flashing because it is durable and malleable. It s not always possible to remove the old flashing in these spots.

Seal the cap flashing by caulking along the mortar joint with polyurethane caulk. There was a metal patch covering a hole rotted trim boards improperly installed flashing which caused much of the initial damage and wood used improperly to cover missing caulking. Sections of l shaped sheet metal are woven into the shingle courses and lapped up the side of the chimney. 1 what is the generally recognized best practice for flashing sealing this joint.

Start at the front of the chimney and mark the third mortar joint up from the roof. I frequently see the sheathing and or housewrap where siding butts into a chimney. 2 aside from tearing off the siding and correcting it from the beginning what do you recommend as a solution when you see the underlying structure at this joint. Vinyl siding on chimneys.

The siding on the chimney and back side of these homes were in disrepair. Repair of a water damaged framed chimney using low maintenance pvc corner boards and fiber cement siding. The first is called step flashing. Flashing materials should be inspected periodically and maintained when needed to prevent leaking problems into the home interior.

Extend this mark around both front corners about 6 in. The next step is to mark and cut the grooves in the chimney s mortar joints to accept the cap flashing.