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Old 03-14-2010, 11:29 PM   #1
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Sealing chimney chase(?)


Greetings, my first post. This forum looks awesome and right up my alley. Anyway, I have a mid 50's house I bought not long ago from the original owners (yes, they lived here for 55 years!) and kept it in pretty good condition. However I'm trying to button up the attic, I started laying down more insulation, weather stripped the scuttle hole, siliconed as much as I could for any electrical holes and expanding foamed plumbing vents.

I then came across this- there is a rather large expanse of space next to my chimney. Here are a few views from above although you cannot see down into the void from the pictures. Batting insulation was stuffed into the gap (I removed it for the pics) but it obviously wasn't doing enough because it was all dirty. I can also see the basement from the attic and vice versa if the angle and lighting are right. I can see the wall board as well.

Anyway- my question is what should I do to seal this? I'd really like to insulate that void between the chimney and the wall board. I'm not sure if this is the proper terminology but I think this is the chimney chase? Could I do blown in insulation to fill the void? Should I even bother? It just seems that with concrete from the chimney being a poor insulator and then wall board being there makes an easy avenue for precious air to escape.

I should mention this house does not have a fire place, the chimney vents the gas furnace and gas water heater, that's it- so I do not believe the chimney gets very hot.






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Old 03-15-2010, 12:33 AM   #2
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Sealing chimney chase(?)


The answer to your question can be answered by a local craftsman or your building inspector.
It may not be possible to insulate next the the brick. Code varies by area.

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Old 03-15-2010, 09:23 AM   #3
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Sealing chimney chase(?)


Usually these areas need to be sealed as a fire stop
I have seen cement used & fiberglass
Cement might not be easy with larger gaps

Not sure what type of material code requires
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Old 03-15-2010, 09:31 AM   #4
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Sealing chimney chase(?)


if this ever can be used as a wood burning chimbly you need 2" to wood framing. I have used cement board and rated caulk as firestop, you can also stuff fiberglass batts as air stop
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