Is it necessary to seal chimney thimble to wall AND liner?

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Old 09-03-14, 06:23 AM
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Is it necessary to seal chimney thimble to wall AND liner?

Last week I had the pros out to replace my rusty thimble and add a wye to combine my new NG water heater with my NG boiler. They were in & out so fast I'm left wondering if they bothered to seal the thimble to the inside of the chimney. From watching Youtube videos that part seems to take the longest to do.

Should I be concerned...does it make any difference whether the thimble is mortared inside the clay liner, or just to the basement wall to prevent CO leakage?
 
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Old 09-03-14, 06:25 AM
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I never mortar to the liner... Just the outside..
 
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Old 09-03-14, 12:35 PM
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To maximize the draft and minimize potential for condensation the thimble really should be sealed to the liner.
 
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Old 09-03-14, 03:23 PM
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Hmmm...
.
 
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Old 09-03-14, 03:32 PM
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This guy says reach your hand in there and fill the gap... Guess I been doing it wrong for 30 years....LOL..

Its probably the right way to do it...

https://www.youtube.com/watch?v=Yxf63IO6jGo
 
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Old 09-04-14, 07:15 AM
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That guy's videos are what I was looking at when I was considering doing it myself. He's a bit of a nut but looks like he knows what he's doing.

Obviously I opted to pay a pro but now I don't know if it's done right. My problem (other than adding the 2nd flue) is the old thimble was swiss-cheesed with rust and I think was the source of the white efflorescence I got every winter on the outside of the chimney. I just don't know if left open if heat & moisture will sneak back into the hole in the cinderblock and continue to be a moisture problem.

Do you think I should take the flues off & reach in to mortar the end of the thimble myself?
 
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