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Old 07-13-2020, 10:36 AM   #1
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Insulating interior wall with attic space behind


Hello all. I have a rectangular room with two attic spaces behind the two long sides. The roofing of the attic has spray foam insulation but the interior walls have no insulation at all. This room tends to be 5-10 degrees hotter than the rest of the house (I live in the south and it gets pretty warm) and I'm guessing its because the interior walls have no insulation. Would putting insulation behind the interior walls fix or st least help tis problem? If so what type of insulation should I use?
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Old 07-13-2020, 10:39 AM   #2
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Re: Insulating interior wall with attic space behind


Any conditioned air going into the attic? If not, you can insulate those stem walls if you want and cover them with radiant barrier.
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Old 07-13-2020, 10:47 AM   #3
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No AC into the attic. Im not familiar with radiant barrier.
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Old 07-13-2020, 11:11 AM   #4
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Re: Insulating interior wall with attic space behind


When they foamed the roof of those attic spaces did they close off all soffit vents. Normally an attic space provides an incoming air path from soffits all the way to the ridge or gable vents. When spray foam is used those paths (both sides) are sealed off. They should have also foamed the end wall exposed to the outside.

If the soffits are sealed and not venting then it becomes a question of how much foam they installed?

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Old 07-14-2020, 08:35 AM   #5
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Re: Insulating interior wall with attic space behind


Also if they face sunny side, southwest or so? If attic is not vented/conditioned. Even if the roof is foamed, heat will build in there and radiate into the rooms. Insulation slows the heat/cold but does not stop them. Insulation itself is a conductor and it's the empty air in the insulation that slows down the energy. Insulating will help but is it worth removing the drywall? What about the roof/attic above these rooms?
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Old 07-15-2020, 08:13 PM   #6
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We have access to the backside if the dry wall so we dobt have to take it down to insulate
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Old 07-15-2020, 08:21 PM   #7
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Re: Insulating interior wall with attic space behind


Insulation will slow down the heat transfer, not stop it. If you have enough insulation in the walls, and the rooms conditioned, you shouldn't feel the heat enough to feel uncomfortable. You may if it's a sunny side and have a sofa or bed next to the wall. Ceiling fan could help by moving the air. Since you've foamed the roof, I think you should just insulate and close the wall and try to condition the room.
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Old 07-23-2020, 12:51 PM   #8
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Re: Insulating interior wall with attic space behind


I have insulated walls like that with batts. I think by "radiant barrier" a previous poster is referring to Reflictix or similar. You will get a higher R-value with batts.

Last edited by RST; 07-23-2020 at 01:14 PM.
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