Thread: rubber membrane used for chimney crown

I'm sure this material is not approved for the chimney crown, maybe the roof.

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Not approved. Often used where there is a significant water intrusion problem and this is a stop gap to buy a few days until the contractor can restore the crown. If that is a solid fuel liner then you do have a much higher risk of fire.

Originally Posted by Sam Morris

I'm sure this material is not approved for the chimney crown, maybe the roof.

I would say it is likely not approved for that install and should be removed (and the crown properly repaired if damaged underneath) by a qualified chimney professional.