Rockwool Vapor Barrier Attic

If it becomes damp or wet the insulation when dried out will maintain the original performance characteristics.

Rockwool vapor barrier attic.

I d personally seal the attic and not use any petro based papers or non inert vapor retarders barrier materials or house wraps like most foams wraps that don t work since they lack cfm or high perm nor are chemically stable. Rockwool stone wool insulation does not wick water which means that any bulk water that contacts the outer surface will drain and not be absorbed into the body of the insulation. Interior moisture that cannot be eliminated must be controlled by employing an effective air barrier and vapor retarder barrier. Despite the fact these two barrier systems are neither the same nor interchangeable there is sometimes confusion in the industry as a single material is often used for both functions.

While there is no need for a vapor barrier you certainly need an air barrier in this location. That s a significant difference especially if you re insulating an entire house or large addition. Drywall with taped seams. Rockwool insulation is moisture resistant yet vapor permeable.

Furthermore stone wool insulation does t wick water. Rock wool insulation for the same wall cost about 1 06 per square foot. Any water that contacts the outer surface will drain and not be absorbed into the body of the insulation. The best air barrier material in this case would be 1 2 in.

Fiberglass insulation for a 2 6 wall costs between 57 cents and 72 cents per square foot. For more information on the need for air barriers behind metal fireplaces visit this useful web page from the u s. Rockwool insulation is moisture resistant yet vapor permeable.