Rockwool Vapor Barrier Attic

Fiberglass insulation for a 2 6 wall costs between 57 cents and 72 cents per square foot.

Rockwool vapor barrier attic.

I design my envelop with two materials that mate well mw and 100 wood period. 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. Interior moisture that cannot be eliminated must be controlled by employing an effective air barrier and vapor retarder barrier. 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.

While there is no need for a vapor barrier you certainly need an air barrier in this location. For more information on the need for air barriers behind metal fireplaces visit this useful web page from the u s. 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 insulation is moisture resistant yet vapor permeable.

The best air barrier material in this case would be 1 2 in. Rockwool insulation is moisture resistant yet vapor permeable. A natural inert plaster stucco on that. If it becomes damp or wet the insulation when dried out will maintain the original performance characteristics.

Drywall with taped seams. Rock wool insulation for the same wall cost about 1 06 per square foot. Furthermore stone wool insulation does t wick water.