Fiberglass insulation has been a staple of building insulation for over 50 years, and recent advancements in recycled content and reduced emissions help ensure its future place in the industry. In less extreme climates, fiberglass can be used as the primary insulation in many structures. In our extreme climate, fiberglass is best used as a supplement to spray foam insulations, as a sound attenuating insulation between walls/levels, or as a retrofit/addition to existing structures. Fiberglass insulation’s biggest advantages are in initial cost and ease of installation, and increasingly in recycled content and V.O.C. emissions. Fiberglass is not an air barrier, that is, it does not control or stop the movement of air, only the movement of thermal energy. It must be used with a vapor barrier to control moisture to prevent degradation of its insulative properties.

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