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Old 11-12-2008, 01:00 PM   #1
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Insulating my garage


Ok, I am looking into the idea of insulating my garage. It is 2x4 with wood siding, which serves at the interior and exterior wall.

here is a picture:

(Hats for sale)

I figure that I'll want to get the roll insulation to do this, but is there anything special i need to do to protect it from the elements? Would it be better to buy the rigid board insulation instead in the 4'x8' sheets and cut it down?

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Old 11-12-2008, 03:23 PM   #2
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Insulating my garage


If thoses are water stains I see where the boards meet, you will need to eliminate the water infiltration before you button up the wall. If the exterior has been covered over with tar paper and another siding material, fiberglass batts are okay to use.
Ron

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Old 11-12-2008, 03:50 PM   #3
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Insulating my garage


Is there any other options aside from residing it? It's a 3 car garage, and that'll get pretty expensive, on top of the cost of insulation.

Could I use a rigid foam board insulation and mount it to the inside of the 2x4's and leave some vent space at the top and bottom?

Currently, I have not seen water come in through the cracks, but there is evidence that it has, as you can see in the pictures.
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Old 11-12-2008, 04:18 PM   #4
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Insulating my garage


I would think leaving the openings would negate the effect of the insulation. Are the wood slats an actual siding material or did someone just nail 1x6's to the studs? If it's a siding with the associated laps from course to course, can't you caulk and paint the exterior to seal out the weather?
There is nothing effective you can do if the structure isn't weather tight.
Ron
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Old 11-13-2008, 06:51 PM   #5
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Insulating my garage


It almost looks like 1x6 T & G... If I were you I would definatly assess the water leakage first. Once you do that theres no reason not to use R-13 batts or roll insulation... But if that gets saturated with water you will have big problems with rott. That insulation holds water like a spung
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Old 11-14-2008, 09:20 AM   #6
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Insulating my garage


Definitely deal with the water before you do anything. If you insulate and don't deal with moisture you stand the risk of mold and deterioration because the wall now can't breath. If it is T&G or lap board, you can caulk the outside seams then keep a good coat of exterior paint on it and you should not have any problems with inside moisture.
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Old 11-14-2008, 09:27 AM   #7
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Insulating my garage


Here is a picture of the exterior. Do you are saying that I can caulk all the cracks to stop the moisture from coming in, then paint it? I was planning on painting the whole thing in the spring anyways, so that might work.

(bottom one)

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Old 11-14-2008, 01:22 PM   #8
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Yep, caulk up in the seams and keep it painted with a good exterior paint and you should not have any moisture problems inside at all. Roll type fiberglass insulation should work just fine.

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