Does Roxul Need A Vapor Barrier In Attic

So does roxul rockwool insulation need vapor barrier or not.

Does roxul need a vapor barrier in attic.

It is important to note that air control is more important than vapor control. The basics of air sealing are covered in this article. Youll see that i mention roxul a lot in that tutorial but roxul is exactly the same as rockwool. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one.

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. 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. 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.

In this moisture prone space you don t want water vapor from the ground drying to the inside of your home. 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 am doing a complete renovation of my house right now and i ve chosen to insulate with roxul comfort batts. If you are planning to have an attic insulation project for your home you may be wondering whether it is important to have a vapor barrier installed as well.

No you don t need a vapor barrier. Moisture transport by air is significantly higher 100x than moisture transport by diffusion. When it comes to the stairway leading into your attic you should heed the advice in this article. Air sealing an attic.

Not every wall does. I am in zone 4 right on the edge of zone 5 in long island ny. The theory is that part of the moisture vapor in the house is actually blocked by the drywall and paint on the. You have loose fill insulation in the attic which doesn t have a vapor barrier.

Our tutorial on how to insulate walls with rockwool is great if you need guidance. The vapor barrier does not need to be sealed to function adequately. What you need is an air barrier that is at every step of the way you have to pay attention to airtightness. 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.

Whether or not you need a vapor retarder hinges on three main factors.