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.

Does roxul need a vapor barrier in attic.

When it comes to the stairway leading into your attic you should heed the advice in this article. For a chart of vapor retarders by climate zone see the naima s insulation and vapor retarders in crawl spaces install a class i vapor barrier such as a vinyl liner on walls and floor. Moisture transport by air is significantly higher 100x than moisture transport by diffusion. Youll see that i mention roxul a lot in that tutorial but roxul is exactly the same as rockwool.

Not every wall does. The vapor barrier does not need to be sealed to function adequately. Our tutorial on how to insulate walls with rockwool is great if you need guidance. The theory is that part of the moisture vapor in the house is actually blocked by the drywall and paint on the.

In this moisture prone space you don t want water vapor from the ground drying to the inside of your home. What you need is an air barrier that is at every step of the way you have to pay attention to airtightness. I keep getting mixed results when google searching some say it depends what climate zone you are in i m in climate zone 3 anyone here knows if that means i need a vapor barrier or not. So does roxul rockwool insulation need vapor barrier or not.

After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. No you don t need a vapor barrier. The basics of air sealing are covered in this article. Air sealing an attic.

A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. It is important to note that air control is more important than vapor control. I am in zone 4 right on the edge of zone 5 in long island ny. 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.

I am doing a complete renovation of my house right now and i ve chosen to insulate with roxul comfort batts. You have loose fill insulation in the attic which doesn t have a vapor barrier. This is primarily due to the kerdi board or wedi. To be able to answer this question correctly for your home there are a few factors you need to consider before any major attic insulation project.

I ve read that i need to use a vapor barrier but i ve also read that vapor barriers can cause houses to be moldy or can cause rot inside the walls because the walls cannot dry out properly.