crumbling sealant at flue to chimney penetration

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rchurchw

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Jun 30, 2016
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Hello,

The sealant between my boiler flue and chimney is crumbling. Should I remove the existing loose sealant and replace it with flue cement or totally remove the sealant and replace with flue cement? I've attached a link to a photo below.

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Thanks,
Ryan
 
For what its worth it would be best to remove old and apply new. Shouldnt be very expensive
 
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