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Old 08-08-2010, 03:30 PM   #1
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Masonry caulk to repoint old chimney?


This house was built around 1890. I'm thinking of hiring a fellow to fix a leak around the chimney area, and he wants to use masonry caulk to repoint the brick. We have not been on the roof yet, but through binoculars it looks like some repointing is needed.

Would a Type O mortar be preferable? If it matters, this is in Wisconsin.

Second question - he would like to use cloth and tar to repair the chimney flashing where it is probably leaking, instead of a reglet and counter flashing. Is that a decent repair?

There are two layers of asphalt shingles over cedar shake shingles, and I am thinking about a re-roof in a few years.

Thank you for any advice.

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Old 08-08-2010, 07:38 PM   #2
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Masonry caulk to repoint old chimney?


Both methods are acceptable repair methods that will last a few years if done properly.
You'll need to address both issues in a more permanent manner when you do the re-roof.

It makes since to use the repair method for flashing now because it's possible that it could get damaged during the tear off process and in that case you would need to redo it again.

With the mortar issue tho, you probably should spend the additional money now and do it right 'not just caulked' because it can be a messy process,
thus you for sure do not want to do work like that after you install your new roofing system.

Edited to add:

In re-pointing, you need to clean the chimney well and use a mortar mix to fill in and than re-strike it all.
(thus better to do it now before the new roof)

With the chimney flashing, you need to remove the existing counter & sub flashing's and install new.
(thus better to do it in the process of the new roof)

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Last edited by Slyfox; 08-08-2010 at 07:42 PM.
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Old 08-08-2010, 10:43 PM   #3
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Masonry caulk to repoint old chimney?


Thanks for your advice.

I will ask him if he is okay with using mortar to re-point the chimney. Is Type O mortar the correct one for this age of brick?

Depending on the condition of the chimney, I am debating whether it would be better to take it down below the roof line when re-roofing, and using a B-vent in its place. What would you do?
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