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Comfortboard 80 is a rigid stone wool insulation board for continuous exterior sheathing, giving R-6.3 per inch of thickness. It is non-structural, so it adds thermal performance to the building envelope without carrying load. Stone wool resists moisture, does not support mold growth, and holds up to fire better than foam boards. It suits builders adding exterior continuous insulation over wood sheathing, though it costs more than rigid foam and is heavier to handle.
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Lowest price we've seen: $75.09 on Nov 14 at Cowls Building Supply. Tracked across 3 stores since Nov 14.
ROCKWOOL Comfortboard 80 is a rigid stone wool insulation board designed for continuous insulation applications. It is a non-structural sheathing product that increases the thermal performance of the building envelope.
The board is a rock-based mineral fiber insulation made from basalt rock and recycled slag. It has an insulation value of R-6.3.
