I had the same problem of uninsulated garage, so while I was in the roof doing that I also threw a few over the water pipes, instead of going to the trouble of using Armaflex (insulated pipe lagging).
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I had the same problem of uninsulated garage, so while I was in the roof doing that I also threw a few over the water pipes, instead of going to the trouble of using Armaflex (insulated pipe lagging).
I've used Rockwool in my garage walls (it gets direct afternoon sun) and it made a huge difference. Also used Rockwool in a another house in the past, easy to use and cheap.