garage insulation

Just stay away from "closed cell" spray foams they are flammable and can't be sprayed anywhere near heat, open flames, heaters or basically anything that could cause ignition. We did the 2 phase open cell spray foam insulation system in our garages down in Florida. You have to hire a professional service and its not cheap so depending on your budget you have other options, there are some DIY systems and aren't that hard to apply but can be messy. I think even home depot has a few systems for large jobs.