Green Board For Bathroom Walls Do I Need Vapor Barrier

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.

Green board for bathroom walls do i need vapor barrier.

Ceiling fans are a great help but are typically not left on long enough 45 mins after a shower. Whenever the steam from a warm shower hits the cool air in the rest of the bathroom condensation occurs. 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. 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.

I think it is a wise choice for mold protection. I would suspect that a water resistant wall board green board was to be used and the international codes as well as the old ubc do not allow this to be installed over a vapor retarder 2006 ibc irc and 2009 ibc editions or a class i or ii vapor retarder 2009 irc in tub or shower compartments. Not every wall does. 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.

I use mr board in any rooms with water fixtures walls ceilings such as kitchen bath laundry. 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. Because of moisture bathrooms are some of the primary areas of your home at risk of mold and mildew development. You don t need to put a vapor barrier in the ceiling of the bathroom.

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. 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 barrier reduces the movement of water vapor by. When you get.

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. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. If you are not sure if you need insulation in your walls follow along with this flow chart.