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Re: [Shop-talk] Advice on insulating a garage

Subject: Re: [Shop-talk] Advice on insulating a garage
From: David Hillman <>
Date: Wed, 6 Jan 2010 12:30:25 -0500 (EST)
On Wed, 6 Jan 2010, Jim Stone wrote:
> The current deep freeze has me again thinking about insulating my 3 car
> garage.  Not doing this when it was first built was a big mistake, but that
> isn't what is keeping me from doing it now.
> Does anyone here have any ideas?  Would flooring it be out of the question?  I
> know that would add a lot of weight, but I also assme it would increase the
> structural rigidity, so maybe it would be a wash?  As always, thanks.

    I insulated my 2.5-car attached garage with 1" thick rigid foam boards 
and it was the best thing I ever did.  I'm pissed that I didn't do right 
after I bought the house, and suffered through some seriously-cold nights 
working out there.

    They weigh next to nothing, so 1 person can do the job alone.  I did my 
whole garage's peaked ceiling in a weekend.  Drywall screws and fender 
washers hold them up, and I used aluminum tape on the seams.  My 
father-in-law did the same on his garage down the street, and they use it 
as living space with a wall-mount natural gas heater.

    With no HVAC in my garage, it stays much warmer/cooler than outside, 
even though the overhead door is 40 years old and doesn't seal well at 
all.  It used to get down to or below zero, but stays at 30 now.  It also 
used to be stupidifyingly-hot in the summer, but now it doesn't break 80.

  David Hillman
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