Insulating a metal shop?

ProjectBazza said

I’ve been watching this one as well, and I’m about 90% certain I’m NOT going to spray foam the walls in my place next summer, but just go with fiberglass batts and call ‘er good. I can use the money saved on the spray foam elsewhere.

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I worked in a metal shop that had the spray foam. Owner of the building was either cheap or maybe couldn't afford to line the shop after the spray foam. It was that way for years and it collected dust and grime. You couldn't do a thing without a trouble light. Place was very dark with the spray foam