Caulking Flashing Around Chimney

The first is called step flashing.

Caulking flashing around chimney.

Sections of l shaped sheet metal are woven into the shingle courses and lapped up the side of the chimney. Flashing is your main defense against leakage so you want to make sure it is securely fastened and that there are no holes or gaps. Proper flashing around a chimney includes two layers. Effective roof flashing around a chimney includes two layers.

Around the front corner as shown. One laying involves tightly playing sheet metal around the chimney edges. Apply a jelly bean size dollop of caulk at the corner where the chimney meets the roof. Most often when a chimney leaks the leak originates in that spot.

Snip and bend a piece of prebent 8 in. Next comes the counterflashing. Check flashing around the base of the chimney along the walls and around the plumbing vents. Embed the corner step flashing in the caulk and nail it to the roof with two roofing nails.

Square step flashing to fit 1 1 2 in. Chimney flashing is the layer of sheet metal that connects the roof to the chimney. In the second layer more sheet metal is inserted into the chimney mortar joints and folded over to cover the first layer. Silicone caulk w caulking gun.

A second layer of metal is embedded in the chimney mortar joints and folded down to cover the top of the step flashing. Look for areas where water might be getting in gaps bent flashing holes made by roofing nails etc.