Rockwool Vapor Barrier Attic

I design my envelop with two materials that mate well mw and 100 wood period.

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. If it becomes damp or wet the insulation when dried out will maintain the original performance characteristics. Interior moisture that cannot be eliminated must be controlled by employing an effective air barrier and vapor retarder barrier. In the event the insulation becomes damp or wet the insulation when thoroughly dried will maintain the original performance characteristics.

Furthermore stone wool insulation does t wick water. While there is no need for a vapor barrier you certainly need an air barrier in this location. Any water that contacts the outer surface will drain and not be absorbed into the body of the insulation. For more information on the need for air barriers behind metal fireplaces visit this useful web page from the u s.

Fiberglass insulation for a 2 6 wall costs between 57 cents and 72 cents per square foot. A natural inert plaster stucco on that. The best air barrier material in this case would be 1 2 in. Drywall with taped seams.

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. That s a significant difference especially if you re insulating an entire house or large addition. Rockwool insulation is moisture resistant yet vapor permeable.