Green Board For Bathroom Walls Do I Need Vapor Barrier

You don t need to put a vapor barrier in the ceiling of the bathroom.

Green board for bathroom walls do i need vapor barrier.

When you get. I had suggested to the home builder that i would rather put 15 lbs felt over the wood wall then put the cement board over the felt but the home builder said that they would not do that. You can t put a vapour barrier behind green board because it creates a double moisture barrier especially where the boards are getting tiled over. The home builder wants to demolish that wall make it plumb and apply green board against the wood wall then apply cement board over the green board.

A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor. Not every wall does. A vapor barrier s job is to keep water vapor in humid air from diffusing through one side of a wall and finding a cool surface inside the wall. You shouldn t be putting safe and sound insulation in there either because that might screw up the moisture air flow behind the boards.

A vapor barrier reduces the movement of water vapor by. It is important to make sure that a proper vapor barrier or vapor retarder is installed on the walls in your bathroom whenever you re building or remodeling. Do you need a moisture barrier when building a shower enclosure. If you are not sure if you need insulation in your walls follow along with this flow chart.

Because of moisture bathrooms are some of the primary areas of your home at risk of mold and mildew development. I think it is a wise choice for mold protection. Greenboard is not fire resistant there is a fire resistant drywall product known as type x that s sold in 5 8 sheets for use around fireplaces and other high risk locations in. When a vapor barrier is on the side of a wall where the dry air is i e outside in winter or inside in summer moisture problems can occur.

After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Greenboard drywall isn t water proof it simply resists moisture better than the standard gypsum board that s on most walls in homes around the united states. I use mr board in any rooms with water fixtures walls ceilings such as kitchen bath laundry.