Hi, my name is Mike and I have been in the home improvement and repair field for 20 years. I will be glad to help you today. Capping the chimney will not be an option. If it is in bad shape it will continue to deteriorate and still leak. At minimum taking the chimney down would have to be done. Sorry to tell you that but the roofer is correct with the assessment.
If you have any further questions I am glad to help so if this has not clarified certainly continue to communicate. I am happy to assist.
The chimney is leaking because it is deteriorating. If it were capped it will still continue to deteriorate. The leaking may stop temporarily but the deterioration will continue and moisture has already penetrated and the flashing beneath is likely deteriorated and compromised. The chimney may be capped and the chimney sealed with roof sealant and this will be an expensive temporary fix that may last 3 or 4 years but in time will cause the same type of damage as before. In the long run capping and repairing will be a patch, not a repair and will eventually be the most expensive option.
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If you have any questions about the information provided I am happy to continue to help. Mike
Any comment at all will help get us going. I am here to help any time you are ready. Mike
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