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Old 08-25-2013, 01:25 PM   #1
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Add blocking to stud cavity for return air?


Ok been working on my upstairs bedrooms and have several project going at once. One of which is trying to determine why I have such poor airflow up there.

I have found that one of my air returns is routed through the attic and is essentially uninsulated and then on top of it has a hole so that will need to get fixed. The register that it originates from is just in a stud cavity of an interior wall which while not the best works. My question is that since the register is near the top of the wall can I and should I add blocking (and caulk) just below it to prevent pulling air from other cavities? Should I do the same for my returns that just go straight down except have the blocking above?

Here is a shot of the duct in the attic that I plan on replacing with a nice foil wrapped duct.


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Old 08-25-2013, 01:32 PM   #2
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Add blocking to stud cavity for return air?


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Originally Posted by info2x View Post
Ok been working on my upstairs bedrooms and have several project going at once. One of which is trying to determine why I have such poor airflow up there.

I have found that one of my air returns is routed through the attic and is essentially uninsulated and then on top of it has a hole so that will need to get fixed. The register that it originates from is just in a stud cavity of an interior wall which while not the best works. My question is that since the register is near the top of the wall can I and should I add blocking (and caulk) just below it to prevent pulling air from other cavities? Should I do the same for my returns that just go straight down except have the blocking above?

Here is a shot of the duct in the attic that I plan on replacing with a nice foil wrapped duct.

yes make that as tight as possible on all your returns so it pulling from just the area of its intended purpose...it will help..ben sr

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Old 08-25-2013, 07:34 PM   #3
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Add blocking to stud cavity for return air?


Thanks. That's what I thought but since I'm not exeperianced with HVAC I figured I would check first.
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Old 08-25-2013, 10:07 PM   #4
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Add blocking to stud cavity for return air?


http://www.buildingscience.com/docum...39-five-things

http://www.buildingscience.com/docum...ong-from-start

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