Chimney Flashing

[Mark P]

There were no signs of leaks and the house is 5 years old, but i'snt the top and sides of the flashing supposed to be under the shingles? The roof was too high and steep for me to get a close look.

Click to Enlarge

44.84 KB

[Steven Hockstein]

Yes. Caulk and roofing cement will most likely fail before the roof has to be replaced. I would recommend that it be corrected before it leaks.

My guess is that the roof was already on the house when the owner opted to add a fireplace. I would be surprised if a roofer was anywhere near the house when the chimney was added.

[Steven Hockstein]

Also- I suspect that the 2-10 foot rule has been violated as well.

[Mark P]

Also- I suspect that the 2-10 foot rule has been violated as well.

Oh Snap - thanks good catch.

[Marc]

Also- I suspect that the 2-10 foot rule has been violated as well.

2-10? Isn't that rule just for masonry chimneys?

Yeah. I generally cover the entire top-half of the flashing with shingles.

Marc

[John Kogel]

The rule is to prevent backdrafting, but for gas burners and B vent chimneys the rule is a bit different than for wood burning and masonry chimneys, I believe. I don't know, can somebody do the math? Are they adding the 2 feet here?

Click to Enlarge

55.34?KB

Actually, we don't need math. On a 12/12 pitched roof, the top of a 4 foot vent stack would only be 4 feet away from the roof. For a woodstove, it would need to be a 12 foot stack.