Just rebuilt chimney & it’s still leaking. we had it brought down into the house rebuilt, reflashed and re-roofed around the flashing area. As well as the roofer was to put down a rain and ice barrier. It’s been raining yesterday & today & we found it is still leaking…much better but still water is getting in
Any thoughts on why the leak?
I'm judging by fuzzy photographs, but the flashing seems to have been done incorrectly. When done right, shingles and step flashing alternate such that any water running under one is still on top of the other. Here we see very large metal flashing laid completely over the shingles, so that any water running or blown under the metal encounters no further drain plane beyond the edge of the shingles.
Here's a diagram of where I'd have expected the shingles to overlay the metal (and lay under the flashing above):
Here's a good example of proper flashing:
There's also a diagram of the step flashing on that article.
I can't be sure this is the problem, and I'd hate to accuse your tradesperson of negligence, but that's where I'd start. Read and understand that article, then compare your situation.
Isherwood is correct - this looks like very poor flashing. I would also add that the lead has not been well formed into the corner. If you are exposed to driving rain in high wind this would increase the chance of rain being blown under the flashing. It is also possible that if it has been built with very porous bricks, in prolonged very severe weather the bricks could be transmitting water through the wall. If that is the case a coat of weather-proofing should stop penetration.
Use chimney brick waterproofing spray or cream. It’s siloxane based. Use as described. It’s looks like your mortar is taking in water. That water gets behind the chimney flashing and behind the ice and water shield. Cheap fix and you should waterproof the chimney brick and seal coat the crown anyways to prevent issues. I mean dude you have moss growing out of it….
