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Old 07-04-2011, 09:16 AM   #1
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chimney crown


While cleaning my masonry chimney this morning, I noticed the chimney crown concrete is starting to crack.
This is the concrete around the tile pipe.
I know that water will find its way here and cause further problems.
What's a good way to seal this?
Is there a homedepot caulk that I can use?

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Old 07-04-2011, 09:30 AM   #2
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chimney crown


First of all, good job, for catching it early, before it leads to problems. You're obviosly on your game, so forget the caulk, and put it near the top or your schedule to replace it. You want to use concrete, not mortar, give it a minimum overhang or 1-1/2" to 2", and adequate slope away from the flue. I like to wrap the flue with a piece of sill seal or similar product, to keep the new crown from cracking in the early stage of the curing process. A couple of beam clamps are handy for holding your forms in place.

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Old 07-04-2011, 11:13 AM   #3
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chimney crown


Concrete caulk will work---widen the crack a bit---apply a generous bead.

Consider Dexters suggestion of a full replacement----angle grinder with a diamond blade and a hammer
drill are the two tools needed that you may not own.---Mike---
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