Does Roxul Need A Vapor Barrier In Attic

This is primarily due to the kerdi board or wedi.

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. I am doing a complete renovation of my house right now and i ve chosen to insulate with roxul comfort batts. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. 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.

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. In some cases the vapor barrier also acts as the primary material in the air barrier system. What you need is an air barrier that is at every step of the way you have to pay attention to airtightness. The basics of air sealing are covered in this article.

The vapor barrier does not need to be sealed to function adequately. 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. So does roxul rockwool insulation need vapor barrier or not.

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. Vapor barriers installed on the interior side of assemblies impede them from drying toward the interior this is a problem for air conditioned spaces and can be an issue when there is also a vapor impermeable material installed on the assembly s exterior creating a double vapor barrier wall assembly. You have loose fill insulation in the attic which doesn t have a vapor barrier. Not every wall does.

Moisture transport by air is significantly higher 100x than moisture transport by diffusion. 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. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Youll see that i mention roxul a lot in that tutorial but roxul is exactly the same as rockwool.

I am in zone 4 right on the edge of zone 5 in long island ny. It is important to note that air control is more important than vapor control. 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. Whether or not you need a vapor retarder hinges on three main factors.

Air sealing an attic.