Leaky Roof Near Chimney - Can't Find Source

locust78March 31, 2010

I'm seeing some water up in my attic along the vertical wall that's opposite my chimney. It looks like it's originating at the very top, where the shingled roof meets the vertical wall, near the peak (where the chimney is).

I went up to inspect and couldn't find anything obvious. A roofer came in & hit the chimney flashing with some caulk. I also added some caulk, but I'm still leaking. I'm pretty sure somehow the flashing/chimney connection is to blame, but I can't find anything.

Should I just go up there & smear the heck out of the whole area with some kind of tar or caulk?

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if i were you i would have a professional come in and check it out. had this problem once and it became infested with ants! horrible time!!

    Bookmark   March 31, 2010 at 8:11PM
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The flashing, correctly known as a cover flashing, is there to prevent water ingress at the point where the tiles meet the chimney, there will also, beneath the flashing, be soakers. These will be fitted horizontally underneath each tile and returned up the vertical face of the chimney.
Your flashing will be chased in approx 1" into your brickwork, and if enough rain soaks the vertical surface of your chimney then it will penetrate beyond the point at which the chased-in flashing terminates.

It's really a case of inserting a cavity tray which will extend the full width of the brickwork, the best option, or waterproofing the stack.

    Bookmark   April 2, 2010 at 12:44PM
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Chimney flashing is actually composed of step flashing (were the roof meets at an angle) and counter-flashing.

The step flashing goes up the masonry and under the roof material, but above the drainage plane under the shingles (often roofing felt). Larger pieces than step flashing can be used if the line is not sloped relative to the roof deck.

The counter flashing is cut into the masonry joints above the top of the stop flashing and extends down to about 1/2 inch above the roofing material.

Simply gluing step flashing to masonry WILL produce leaks (if not immediately in a few years).

Caulk and tar are not used to waterproof flashing, but as a temporary fix (at best) for failed flashing.

The older way of securing the counter flashing was by driving lead into the groove in the masonry to wedge the flashing tight.

There is Portland cement based 'caulk' available now that can be used to secure the counter flashing into its groove in the masonry.

    Bookmark   April 2, 2010 at 4:32PM
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