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Old 12-19-2013, 04:23 PM   #16
Join Date: Dec 2013
Location: New York City
Posts: 8
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chimney cap mortared in place?

Hey Windows on Wash,

Thanks for your response, that is my plan. I have a question about caps. Most caps basically cover the flues, and a few (expensive) seem to cover the whole crown. It would seem my choices are to rebuild the crown and get a cap that covers the flues, or just cover the entire crown with a bigger cap and not have to worry about waterproofing the crown. The second option seems so much easier. With a stainless cap covering the surface and attached by tapcons through the vertical side, my chimney seems like it would be much less vulnerable to weathering over the long term. Yet the trend clearly is towards smaller caps and some even recommend NOT using whole crown caps. But they don't clearly explain why. Any thoughts/experience on that?
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Old 01-25-2014, 04:09 PM   #17
Join Date: Dec 2013
Location: New York City
Posts: 8

chimney cap mortared in place?

An update on my chimney:

I had a chimney 'guy' come out here, and he pointed out that the clearance between the chimney liner and the homemade chimney cap is too small. It's not allowing sufficient venting for the moisture in the exhaust gas, instead it's condensing on the inside of the chimney cap, and essentially raining in there all the time.

I removed the top part of the chimney cap, and have temporarily tarped off the chimney top (except for the venting chimney liner, of course) while the new chimney cap and chase cover (pan) arrive. It's been over a week now without the cap on, and the chimney seems to have dried significantly. The attic is now heated to about 55F, and there is no more water seeping out of the chimney. It's possible there still will be an issue in the future, but the chimney cap was definitely the major cause of the wetness. And it has probably been going on since the liner was installed (2 years ago).

Thanks for everybody's help and I hope this helps someone in the future.
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