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Old 02-20-2008, 06:01 PM   #1
drh
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Suggestions on how to fill and seal an old chimney?


Recently, we've gone with a direct-vent boiler that allowed us to vent directly through the side of the house, leaving in its wake, an old chimney that is now decommissioned.

The old chimney brick has been knocked out, leaving a sizable hole in the basement wall (pictured) that needs to be closed up. What is the most effective way for me to seal up this hole so that it is flush with the concrete block on either side of it?

This wall will be insulated and drywalled in the future, but for now I'd like to backfill the old chimney hole and plug it up so that it is not so much of an eyesore.

Many thanks for the advice!
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Old 02-20-2008, 07:01 PM   #2
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Suggestions on how to fill and seal an old chimney?


I would remove the entire chimney from the roof down for safety sake. If not, then at least put blocking under the blocks between the joists to help hold it up. next, take some old bricks and brick up the hole.

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Old 02-20-2008, 07:09 PM   #3
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Suggestions on how to fill and seal an old chimney?


What you have there is a disaster waiting to happen. You need to infill the removed masonry, sooner better than later.
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Old 02-20-2008, 07:27 PM   #4
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Suggestions on how to fill and seal an old chimney?


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Originally Posted by Tscarborough View Post
What you have there is a disaster waiting to happen. You need to infill the removed masonry, sooner better than later.
Yes sir, there should be an air gap around the framing for air flow, so there is really nothing at all holding it up. Thats why I suggested removing the entire thing from the ROOF DOWN.
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Old 02-20-2008, 07:45 PM   #5
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Suggestions on how to fill and seal an old chimney?


Removing a chimney is no small thing and bricking that one up is no big thing. Just do one or the other.
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Old 02-20-2008, 09:11 PM   #6
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Suggestions on how to fill and seal an old chimney?


The chimney itself is tied into (and gaining the majority of its support from) the exterior and interior brick wall on the main floor. The bricks in the basement were in such a state of disrepair that pieces had already begun falling away.

The bricks in the basement were simply built around the opening of the chimney (which begins at chest height on the wall) and were not structurally tied to the upper stack. We've installed wood block between the joists for safety sake and the plan is to in-fill the cavity with the removed brick and encase the bricks with mortor.

Once the hole is sealed up, and the weather warms up, the chimney will be removed top/down.
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Old 02-20-2008, 09:27 PM   #7
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Suggestions on how to fill and seal an old chimney?


The 4x8x16 CMU is not tied in, but the brick of the chimney stack are sitting on the brick behind the CMU. You have removed almost 50% of the support, concentrated on one side.

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