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dahirolla 11-14-2009 03:25 PM

Retrofit flashing on rock chimney
Oh man...I'm not sure where to go with this...first objective was to keep squirrels out of my attic. Now in addition to that, I want to keep water out of my attic.

I have an irregular rock chimney butted up to the plywood siding, under an overhang.

I'd like advice on sealing the gap you can see in the pictures.

It looks to me, buy the flashing on the inside of the bottom picture, that I'm above the original roof line, and that whoever added a second story didn't tie the flashing into the chimney correctly.

It's been suggested that I use hardware cloth combined with expanding foam insulation to fill the space, which would keep the squirrels out, but I'm not sure about the water.

BTW, I've read that typically you cut a channel in the side of the rock in which to embed another flashing run, but as you can see by the irregularity of the rock surface, and by the ease (lack thereof) entry, I can't really get a grinder or saw in there.


Bob Mariani 11-14-2009 06:42 PM

I would use a 14" diamond saw to cut a groove in the stone. (we do this all the time) It will cut like butter. Sealing with flashing is the only solution. Grout the slot in the stone after attaching the new flashing. Be sure to overlap over the lower existing flashing. Fill the void with spray foam to insulate and provide a air and vapor barrier.

harby 11-20-2009 11:15 AM

Angle grinder with a diamond blade is what roofers use. You only need a small slit for a reglate. 14 inch saw is to big to use for this.

Bob Mariani 11-20-2009 01:15 PM

under normal circumstances you are correct, but these stones are too big and you need the bigger blade

harby 11-20-2009 01:43 PM

Really, I am not refering to a little dinky 4 incher, a 9 inch angle grinder would be fine for this. Your not cutting the chimney in half!

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