Does Roxul Need A Vapor Barrier In Attic. In some cases the vapor barrier also acts as the primary material in the air barrier system. Our tutorial on how to insulate walls with rockwool is great if you need guidance. And by the way if you re remodeling a shower and use rockwool with kerdi board or wedi s shower system there s no need for a vapor barrier.
Moisture transport by air is significantly higher 100x than moisture transport by diffusion. I install my vapor barrier in the middle of the wall system between the two walls.
In this moisture prone space you don t want water vapor from the ground drying to the inside of your home.
This is primarily due to the kerdi board or wedi. In some cases the vapor barrier also acts as the primary material in the air barrier system. Not every wall does. The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below.
