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Old 02-23-2019, 10:15 PM   #1
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Garage header insulation


I was just wondering a couple of things about insulating my garage. I've insulated all the walls. I used rolled insulation with paper facing. Do I need to use any additional vapor barrier, and should I insulate the headers over the doors and windows? These are exterior walls. The ones adjacent to my house were insulated and sheetrocked when the house was built. Any advice or expertise would be welcomed! Thanks!
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Old 02-23-2019, 10:21 PM   #2
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Re: Garage header insulation


The paper is vapour barrier and if the room at the headers you put in what every you can fit, sometimes there is no room for anything.
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Old 02-23-2019, 10:24 PM   #3
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There's a little room. But is it necessary?
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Old 02-23-2019, 10:33 PM   #4
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Re: Garage header insulation


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Originally Posted by Bones519 View Post
There's a little room. But is it necessary?
I really doesn't help a lot, I have seen layers of foam board used to fill it up but often we fill that space with a full sized beam and there is no room.
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Old 02-23-2019, 10:42 PM   #5
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Thanks! I appreciate it.
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Old 02-24-2019, 12:19 AM   #6
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Re: Garage header insulation


I filled mine with foam board as Neal mentions... itís easy enough to do and not expensive..
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Old 02-24-2019, 05:59 AM   #7
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Re: Garage header insulation


Why not insulate ? You insulated the rest of the walls do it now while it is open .
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Old 02-24-2019, 11:43 AM   #8
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Re: Garage header insulation


You should absolutely insulate those headers! Use a piece of rigid foam board and not fiberglass batts there. You can also use a little canned spray foam to seal the corners if you want to. If you have the canned foam or are willing to spend the $4 for it, get the low expansion window and door version and fill the little gaps around the window framing.
The reason you want to insulate that gap even though it is small, is because it will otherwise be a thermal bridge from the outside. That little bit of foam breaks the thermal transfer to the outside so it does more than it's low R value would lead you to believe. The window is already a cold spot, so an uninsulated header is going to make it worse, and the void can pull warmer room air in where it will condense on the cold wood giving mold an opportunity to grow. That piece of foam has an R value of maybe 5 which isn't much, but it does make a big difference.
Like Neil pointed out, you don't always get that space, but when you do you should definitely take advantage of it.
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