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Old 10-27-2008, 02:29 PM   #1
buening
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Default Easiest way to insulate walls that are already finished?

The person that originally owned and built our house did not insulate the garage walls. The walls are finished with drywall. Other than ripping out all of the drywall, are there any suggestions in getting the walls insulated fully with minimal patching? Would blow-in insulation work? Maybe put a hole in the wall near the ceiling between each stud and put the blow-in insulation in? How effective would it be? They installed an insulated garage door but didn't insulate the walls
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Old 10-27-2008, 02:40 PM   #2
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Default Re: Easiest way to insulate walls that are already finished?

Here's a previous post... http://www.garagejournal.com/forum/s...insulate+walls
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Old 10-27-2008, 03:23 PM   #3
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Default Re: Easiest way to insulate walls that are already finished?

Perfect! I tried a search but nothing relevant to my question came up. Thanks!
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Old 10-27-2008, 05:26 PM   #4
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Default Re: Easiest way to insulate walls that are already finished?

The only way I know of is blown insulation. The only issue is if there are any "Catwalks" in the wall it will stop the insulation from droppping down in to the wall. I guess they can tell by how much goes in whether there are any in there.
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Old 10-27-2008, 07:08 PM   #5
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Default Re: Easiest way to insulate walls that are already finished?

Blow in insulation will do the trick. Locate the bays and drill some 2 1/2" holes. Save the pieces of sheetrock you cut out. Blow insulation in, then take a piece of strapping and slide it in the hole secure it with a couple drywall screw on each side then screw the plug to it. Tape, compound, and paint
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Old 10-28-2008, 11:58 AM   #6
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Default Re: Easiest way to insulate walls that are already finished?

Any easy way of estimating how much insulation will be needed (for a cost estimate)? I can calculate the total volume of the wall, but I wasn't sure if the volume of the insulation is actually what is needed (settlement?). I plan on doing the walls and between the rafters of the ceiling. The garage is a 2 car that is roughly 22' square. I'm not sure if I should do the shared wall or not, would you? It is the only wall where they put OSB and then drywall on the interior face of the garage wall. The exterior face is OSB for the entire perimeter of the garage.
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Old 10-28-2008, 02:59 PM   #7
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Default Re: Easiest way to insulate walls that are already finished?

The main thing insulating the shared wall will do is please SWMBO with a lower level of noise from the garage .

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Old 10-28-2008, 03:10 PM   #8
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Default Re: Easiest way to insulate walls that are already finished?

I would do it for sound purposes. The bags at HD or Lowes will tell you how many sq ft it covers for a 2x4 wall
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Old 10-28-2008, 03:14 PM   #9
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Default Re: Easiest way to insulate walls that are already finished?

Thanks for the help!!!
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Old 10-28-2008, 03:36 PM   #10
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Default Re: Easiest way to insulate walls that are already finished?

I have one more question. The attic of the garage is open between the rafters, and I had planned on putting the cellulose insulation between the rafters. I've read that it is ideal to install a moisture barrier between the insulation and the drywall. It appears there isn't one between the ceiling drywall and the rafters. The ceiling is finished with the knock-down spackling but hasn't been painted. I haven't ruled out using a moisture barrier paint, but I've read that people recommend using polyethylene sheeting as a moisture barrier. I wonder if/how this can be used with the method of insulating I was planning? Would the sheeting just droop between each rafter? The garage won't be heated or air conditioned constantly, but there will be winter months where a space heater will be used. I'm located in Illinois, if that helps any
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Old 10-29-2008, 11:05 AM   #11
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Default Re: Easiest way to insulate walls that are already finished?

I think I'll be going with the paint system. I found on Lowe's website that you can staple the polyethylene to the rafters but that sounds like a pain.

I just got an estimate from a local insulation contractor. To do my three walls and attic of my 19x21.5 garage (attic to R11) they want $850. To get to R19 value in the attic, they want $925. That sounds pretty darn high, looks like this will be another DIY project
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