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Fiberglass vs. Steel Doors: Is There Really a Difference?Fiberglass and steel doors are similarly insulated with polyurethane foam or rock wool. As long as the door does not have a glass insert, insulation values range from R-5 to R-6. Fiberglass and ...
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The Best Types of Attic InsulationAir is one of the best thermal insulators, and fiberglass insulation makes use of it ... with slag — a byproduct of the ...
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