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Old 12-28-2016, 09:09 PM   #1
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Air gap between brick and plaster in the attic


I live in a 1950's end unit townhouse and am working on bumping up the attic insulation. I've been reading and learned about the reason for the air space/air gap between the exterior brick and the plaster wall. What's the correct way to deal with this gap in the attic? Do I leave the blown in insulation covering it in place, remove the insulation, or something else?

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Old 12-29-2016, 10:37 PM   #2
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Re: Air gap between brick and plaster in the attic


--------------Welcome to the forums!-----------------------

Pics would sure help...

Usually the wall space is blocked off from the attic or else the wet air (moisture on the back of brick/WRB) communicates to the attic. FG won't stop it. Need to make sure the top space has openings to front of bricks first- by way of fascia/freeze board- or out past brick by soffit area in front; https://buildingscience.com/document...voir-claddings

Gary

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Old 12-30-2016, 06:31 AM   #3
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Re: Air gap between brick and plaster in the attic


Gary - thanks for the link, that explains a lot!

In my case, the space is not open to the outside, which leads me to believe that I should leave the air gap uncovered. I've attached a picture (if it works) that shows how it looks from the attic.
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Air gap between brick and plaster in the attic-img_4785.jpg  
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Old 01-01-2017, 07:55 PM   #4
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Re: Air gap between brick and plaster in the attic


Yes, if that is the only outlet, leave it be (and clean it out). Add some baffles (for clear air channel) in front of your blown-in so it doesn't get wind-washed and protect it from air movement which degrades the R-value. IF FG- as in pic.-, think about adding a few inches of cellulose over the top to stop convective loops and muting the R-value of the top few inches of blown-in FG from cold air flowing in the intakes or from behind brick. Or if you have or are able to build a cat-walk, you can install housewrap from there -- over the top to handle same. Links if needed.

Gary
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Old 01-07-2017, 10:22 AM   #5
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Re: Air gap between brick and plaster in the attic


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Originally Posted by Gary in WA View Post
Yes, if that is the only outlet, leave it be (and clean it out). Add some baffles (for clear air channel) in front of your blown-in so it doesn't get wind-washed and protect it from air movement which degrades the R-value. IF FG- as in pic.-, think about adding a few inches of cellulose over the top to stop convective loops and muting the R-value of the top few inches of blown-in FG from cold air flowing in the intakes or from behind brick. Or if you have or are able to build a cat-walk, you can install housewrap from there -- over the top to handle same. Links if needed.

Gary
I installed baffles, will clean up the insulation on top of the gap/outlet and go from there.
Thanks again for the recommendations!
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