Mineral Wool vs Fiberglass Insulation: A Buyer's Guide

Mineral Wool

When it comes to thermal performance, mineral wool batts excel beyond fiberglass batts, offering a remarkable 22–37% higher R-value per inch. Specifically, mineral wool can achieve an impressive R-value of up to R15 for a thickness of 3.5 inches.

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Fiberglass

In comparison, fiberglass insulation provides an R-value of R13 for the same 3.5-inch thickness.

Fire Resistance

Mineral wool boasts a significantly high melting temperature, capable of withstanding fires up to 2,000°F, making it an excellent choice for exterior installations. It does not release smoke or spread flames in case of fire, adding an extra layer of safety.

Fiberglass

On the other hand, fiberglass has lower fire resistance, melting at temperatures around 1,200°F.

Weight Considerations

Due to its higher density, mineral wool can be heavy, and may not be suitable for use in attics, particularly where insulation needs to be laid on gypsum board.

Fiberglass

Conversely, fiberglass is comparatively lightweight, making it ideal for installation in spaces like attics.

Soundproofing Capabilities

Due to its high density, mineral wool offers exceptional soundproofing properties, making it an outstanding choice for use in interior walls, ceilings, and floors.

Fiberglass

Its lower density results in reduced efficiency when it comes to soundproofing compared to mineral wool, although the difference may be subtle in practical applications.