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Old 12-08-2007, 02:39 PM   #1
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Insulating a garage


I would like to get at least a little control over the climate in my 2 car attached garage. I live in Minnesota, so we have very cold winters. I would like to spend as little as possible at this point. The garage is simply 2x4 studded walls at this point. What is the minimum I need to do as far as vapor barriers/types of insulation? Can insulation be left exposed in a garage, or do I need to put some type of wallboard up? How about the ceiling - what is the easiest way to get that insulated. Just open rafters now. Thanks very much for any help or advice!!

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Old 12-08-2007, 04:59 PM   #2
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Insulating a garage


You can insulate until you;re blue in the face, without a source of heat, what do you expect to accomplish?

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Old 12-08-2007, 05:56 PM   #3
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Insulating a garage


Right, I would also be looking for a heater of some type to go along with the insulation.
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Old 12-08-2007, 06:22 PM   #4
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Insulating a garage


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Originally Posted by leted_82 View Post
Right, I would also be looking for a heater of some type to go along with the insulation.
Use R-13 on the walls and R-19 on the ceiling rafters. You might want to consider installing sheetrock to get an "air-tight" area.

Heat source: Consider an "in-wall Heater". Links:

http://www.air-n-water.com/electric-wall-heaters.htm

http://www.nextag.com/wall-heaters/search-html

http://www.bizrate.com/heaters/produ...l+heaters.html
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Old 12-08-2007, 06:24 PM   #5
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Insulating a garage


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How about the ceiling - what is the easiest way to get that insulated. Just open rafters now.
Install wood strapping 16 O.C. to the rafters.
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Old 12-11-2007, 07:27 PM   #6
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Insulating a garage


You must drywall if you insulate to achieve an adequate fire rating.
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Old 12-11-2007, 08:37 PM   #7
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Insulating a garage


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You must drywall if you insulate to achieve an adequate fire rating.
Clarification:

A fire-rated separation wall is only required on the walls & ceilings that are separating the main home from the garage. NOT necessarily the entire garage interior surfaces.

Example: Garage "under" a home, or under a "bonus room", etc. = All surfaces.

Garage at the end of the main house: In that arrangement, a firewall is required on the connecting wall (one side/ one-hour fire rating) and all the way to the roof sheathing. If the fire rated sheetrock (GWB) is placed on the interior side of the main house, then, that suffices too.

For a more detailed explanation, consult your local Code enforcement dept. (Building inspectional services)
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Old 12-12-2007, 10:44 AM   #8
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Insulating a garage


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Originally Posted by AtlanticWBConst. View Post
Clarification:

A fire-rated separation wall is only required on the walls & ceilings that are separating the main home from the garage. NOT necessarily the entire garage interior surfaces.

Example: Garage "under" a home, or under a "bonus room", etc. = All surfaces.

Garage at the end of the main house: In that arrangement, a firewall is required on the connecting wall (one side/ one-hour fire rating) and all the way to the roof sheathing. If the fire rated sheetrock (GWB) is placed on the interior side of the main house, then, that suffices too.

For a more detailed explanation, consult your local Code enforcement dept. (Building inspectional services)
You are correct EXCEPT, you forgot one thing. This is for bare stud walls. Once you put up insulation, you must protect it from fire, both for the flame spread and the release of noxious gases.
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Old 12-12-2007, 10:59 AM   #9
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Insulating a garage


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You are correct EXCEPT, you forgot one thing. This is for bare stud walls. Once you put up insulation, you must protect it from fire, both for the flame spread and the release of noxious gases.
Good point, absolutely correct.
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Old 12-13-2007, 08:08 AM   #10
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Insulating a garage


I would use blown cellulose in the ceiling, I HATE fiberitch.
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Old 12-13-2007, 11:43 AM   #11
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They make itchless fiberglass batts now.
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Old 12-13-2007, 11:50 AM   #12
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Insulating a garage


I came on here to ask a similar question, so I figure I'll piggyback off the bottom of this thread.

Does it make sense to insulate/drywall garage walls without doing anything to the ceiling? Like the OP, I also have empty rafters in the ceiling.

I just don't think I have the time/money/expertise to do the ceiling, though I could probably do the walls in a day or so.
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Old 12-13-2007, 12:17 PM   #13
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Insulating a garage


My garage is drywalled by the builder and I assume it has all the insulation required inside the drywall...etc... still very cold... why... the garage door itself I think has a lot of gap making insulation won't work... unless the garage door is replaced with regular doors, and the garage is therefore not being used to store cars... then insulation will work... otherwise... I doubt it is a worth investing project....
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Old 12-13-2007, 01:28 PM   #14
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Insulating a garage


There's no reason a garage door should have substantial air leaks. There should be a gasket around the jamb on the sides and top, and there should be a big rubber seal at the bottom of the door which can be adjusted to make even contact with the floor.

I would not assume that your builder insulated the drywalled garage walls, except for the wall adjoining the house.
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Old 12-13-2007, 03:57 PM   #15
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Insulating a garage


Assuming a gable or hip roof and not a flat roof, insulating and drywalling will help reduce the heat load from the roof. IF a flat roof, it is mandatory or heat will be trapped between the joists and radiate down like the elements in an oven.

Hip or gable roofs can keep heat down with proper ventilation, but without insulation they are useless in keeping heat in during the winter.

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