We recently finished a house that included a large stone chimney which projected through two rooflines; a gable roof below and the bottom of a shed roof above. We built a cricket above and left the flashing details to the roofer and the mason. The chimney was a block structure that was faced with a natural thinstone veneer. The roofer flashed and stepflashed the entire thing against the block and the mason mortared his stone to the block, coming down over the aluminum flashing. The house successfully endured about six months of weather until a recent storm with plenty of wind-driven rain pushed water into the great room under the lower gable roof. We went back and reshingled the uphill side of the chimney and installed open shingled valleys on the cricket (with a W-shaped pan) hoping to find an obvious point of entry for water in the process.We didn’t find one. Our only conclusion was that the entire chimney mass had become saturated with water, which then seeped into the building behind the flashing. We hit the entire chimney with four coats of a masonry sealer and are now crossing our fingers. I don’t think that a cut-in counterflashing would remedy this problem, so my question is how can we avoid this in the future?
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so my question is how can we avoid this in the future?
Through flashing all the way to the flue with copper or lead.
lead thru flashing and anything other than AL for flashings Copper, 24GA galv, lead, anything.
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