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Best/economical "Insulation " for metal building9/25
Gable roof sll metal building 40 × 60 . Retirement shop. Need insulation. My internet search is all bias reviews from sales people.....
Thoughts and advice...
Don't know what sll is but I went with 1 1/2" spay foam on the inside of the exterior metal and 6" fiberglass inside of that. Blow in cellulose in the attic. Love it. Don't skimp on insulation.
agreed on spray foam. not sure about "economical" but it's superior - shoot closed cell on the metal, and then as stated either more closed cell if you can afford it, or fiberglass/cellulose. i have 6" of closed cell in my building (especially in the rafters), and it's fantastic.
good luck with your build.