I live in the northeast (NY - Mid Hudson Valley), and have been fighting a roof leak around my chimney for many years. Originally I had a new roof installed, and new copper flashing embedded in the mortar around the chimney. That seemed to solve the problem for a while. Then, after a few years, in some heavy rains, I'd see a small amount of leaking again. Eventually the chimney crown started cracking, and the chimney itself was in need of serious work, so I decided to have the entire chimney rebuilt. They embedded the original flashing into the mortar. After the first couple of rains, water came flooding in. The chimney guys came back and couldn't find the problem, but decided to seal the chimney and crown. That didn't help. I finally figured out that the flashing cap embedded in the mortar on the peak side of the chimney overlapped flashing from the cricket, where the cricket meets the chimney, and that overlap wasn't sealed in any way. Water was running up into that seam and getting under the flashing. I sealed that seam real good with silicone sealant, and the problem seemed to be fixed (for about a year). But just recently, after some snow sat up there for a while, and then it rained, some water started leaking in again. I can't see where it could be getting in around the flashing, but my best guess now is that it's backing up the cricket, and getting under some asphalt shingles that meet/overlap the cricket. Does anyone have any ideas/suggestions? Here are some details:
size of chimney : 6'2" wide X 2'10" deep X 3'4" high. The chimney begins only 2'6" from the peak of the roof. The shingles are asphalt. The flashing is all copper. A cricket (covered in copper) starts about at the peak and meets the back of the chimney (so the total width the of the cricket is 6'2" where it meets the chimney). The slope of the roof is 5.5 to 12. Since the chimney is so close to the peak of the roof, the slope of the peak of the cricket is almost 0 (it does have a very slight downward slope). The peak of the roof has a ridge vent in it, and that is covered with a cap of pieces of asphalt shingles. The cricket starts right under that cap. Could water be backing up under that cap? I've just tried sealing where that cap meets the cricket, and where the sides of the cricket meet other shingles with 'Henry 208 wet/dry roof cement'. Anything better to use? No rain yet, so I'm not sure if that will fix the leak or not. Thanks very much for any suggestions.
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