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Old 01-24-2009, 06:49 PM   #1
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Chimney cap crumbling: any solution

I, I have a chimney cap which I capped two years ago with mortar. That was evidently not a good choice since now its surface is crumbling and can be scratch with a fingernail. Is there any solution to fix this problem that does not involve replacing the entire cap? What about thin set? In case I have to replace what is the best material? I live in western connecticut where there is lot of freeze and thaw and snow and ice etc. Thanks you very much.


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Old 01-24-2009, 08:07 PM   #2
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I found a product made by WEATHERTITE, called flexible crown. Used it about 4 years ago and has held up like I put it on yesterday. Its a latex product and you would trowel over you existing crown (way up on the roof you don't have to be all that neat). Easy to work with.
But, but, but, expensive. Not certain if it was a two or five gal. bucket I purchased, costing around 180.00. As it turned out I went in with a few of my neighbors and split the cost. Don't know where your located, you can do a goggle search and get more info. regarding the product and where to purchase.


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Old 01-24-2009, 10:19 PM   #3
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Old 01-25-2009, 03:21 AM   #4
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I`d have the top taken out,replaced,then look at viable coatings
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Old 01-26-2009, 04:57 PM   #5
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The cap should not be done with mortar, but cement instead.

This would be a better question asked in the brickies forums section though probably.

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Old 01-29-2009, 11:42 AM   #6
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If it's got a few minor cracks you can use a good polyurethane grade caulk for a short term fix. However ultimately the cap will probably need to be rebuilt. Contact a qualified masonry contractor who can construct a custom poured in place cement chimney cap. Metal would also be fine, but fix what's there first.
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Old 01-31-2009, 06:04 PM   #7
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Frequently when I see deteriorating masonry chimney caps at inspections there are significant associated problems, for example cracked flue tiles due to lack of an expansion joint between the camp and the flu or damage to masonry below because of water entry through the caps, insufficient overhang, mis-pitched caps, missing drip grooves on the underside of the caps, and the like. Putting an elastomeric covering on the cap may address some of these, but not others.

Masons will give you differing opinions about the details of "best practice" for masonry cap construction , however two useful links to start with are and


Last edited by Michael Thomas; 01-31-2009 at 06:07 PM.
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