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Old 08-05-2016, 12:36 PM   #1
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Garage insulating ideas?


Hello, new member here.

I'm building a big garage in central tx right now, a three bay with a wall separating the third bay. I plan on insulating the third bay (16'x30' with 9' a ceiling) and putting in a ductless ac.

I'm also going to frame up a room in the attic, which will be 12'x23' with 13' a ceiling. It will not be directly above the insulated third bay. I will insulate it and use the same ac unit (it will be a multi room system) for it.

Can you guys please give me suggestions on how to insulate both of these? Neither the shop or room upstairs will have people in them constantly. Just a few hours at a time every now and then.

I don't mind spending money on quality insulation, if it will help the rooms cool down faster and stay cool. But if I can get away with less expensive stuff, I'm all ears. Thanks!!
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Old 08-05-2016, 01:13 PM   #2
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Re: Garage insulating ideas?


Whats the roof and wall construction going to be like. In Texas, best bet is to keep the heat and moisture out of the space to be heated from the design standpoint.
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Old 08-05-2016, 01:25 PM   #3
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Re: Garage insulating ideas?


I'm trying to post a pic but it's saying I need more posts?
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Old 08-05-2016, 01:26 PM   #4
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Re: Garage insulating ideas?


Here's a pic. Shingle roof and brick still has to go on. The shop is on the right, the upstairs room will be more or less right in the middle.
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Old 08-05-2016, 01:33 PM   #5
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Re: Garage insulating ideas?


Looks nice.

Some foam to the outside of the wall before the brick would help a bunch with the moisture and the heat from the exterior as well uncoupling the framing from the hotside wall.

Roof is already framed so are you going with a vented roof/soffit design or yet unsettled?
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Old 08-05-2016, 01:36 PM   #6
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Re: Garage insulating ideas?


The roof has soffit vents and a full ridge vent.

Think that spray in would be too expensive to mess with for this application?
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Old 08-05-2016, 01:36 PM   #7
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Re: Garage insulating ideas?


First, I would insulate all of the outside walls plus the wall between the conditioned garage and the part which will not be. Roxul is the first choice coming to mind.

What's the design of the upper level? Are there knee walls and such?
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Old 08-05-2016, 01:42 PM   #8
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Re: Garage insulating ideas?


The design of the upstairs room will be basically a framed in box, no knee walls.
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Old 08-05-2016, 02:00 PM   #9
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Re: Garage insulating ideas?


Spray foam would be great, but isn't cheap.

Take a look at this pdf. I think a combination of baffled system that is sealed along with some batting would work great. In you combo, the foil faced ISO board would be great for that foam baffles to reject the heat and moisture.

http://www.finehomebuilding.com/pdf/021221068.pdf
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Old 08-05-2016, 03:44 PM   #10
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Re: Garage insulating ideas?


I'm getting a guy to come out and give me a quote for spray foam, if I can justify the price I'll go that route.

Can I go all the way around the upstairs room and third bay? Open cell or closed cell? I've heard you can have air problems with closed cell foam all the way around just because it is too sealed off. Any truth to this?
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Old 08-08-2016, 03:31 PM   #11
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Re: Garage insulating ideas?


What do you plan on doing in this workshop? You may not want to mix the air with your upstairs space.
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Old 08-08-2016, 08:39 PM   #12
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Re: Garage insulating ideas?


I don't plan on mixing the air.
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Old 08-12-2016, 01:48 PM   #13
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Re: Garage insulating ideas?


I doubt you could add much foam board to the exterior, with the framing already up and the brick ledge set in the concrete wall thickness already. At the planning stage, sure- but not now. My experience (nice to have when answering like this) tells me you would need to either; cantilever the brick veneer even more or lose precious air gap/drainage space between the wood/brick. Both would be wrong... speaking of wrong- at least on the sunny side of house/garage; http://buildingscience.com/documents...ir-spaces/view

The knee walls; http://buildingscience.com/documents...ity-insulation

Use foil-faced on the garage ceiling below the conditioned room, Fig.6; http://buildingscience.com/documents...in-crawlspaces

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Last edited by Gary in WA; 08-12-2016 at 01:51 PM.
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