Like Smart Seal said, it varies. It depends on if you're getting open or closed cell foam, how thick it will be, how tall the walls are, etc etc. Definitely give them a call and they'll come up with a quote for you. That's going to be the best way to get an estimate.
That is correct, there are so many variables that are considered in each estimate. Especially, if you will be heating and cooling your metal building and if it will be exposed to UV rays.
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