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So I got a quote today, I’m in northern VA so climate zone4. The guy measured up and for closed cell spray insulation of an R15 value on the walls and roof, total of 3200 sqft it’s $7k Thoughts ?

Sorry, should have said, Northern VA so can be hot and humid and freezing cold!

Just bought new house and have a detached 40ft x 30ft metal workshop, looks like the previous buyer started studding it out to insulate it. I'm a newbie to this, whats the best insulation to use ? whats the best boadring to use after the insulation? should i get a guy in to do spray foam ...