Menu Close

Do you vapour barrier ceiling or walls first?

Jim Brown

Do you vapour barrier ceiling or walls first?

To start installing poly it does not really matter if you do the walls or ceiling first but I prefer to do the walls in a room first. So to do the walls start by deciding how big of a piece you can handle and cut if from the roll. I would start with about a 8 foot piece until you do one to make it easier.

Do I need a vapor barrier in my bathroom ceiling?

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.

What kind of insulation do you use in a bathroom ceiling?

Best bathroom insulation Sprayed insulation, such as cellulose or foam, are usually smarter choices than fiberglass for your bathroom. Because fiberglass tends to be more porous, moist air is likelier to flow through it. Another path is foam pipe insulation, which will keep pipes warmer during cold months.

What do you put on ceiling above shower?

1. Drywall and greenboard. You can go for regular drywall in ceilings above the non-shower or tub areas of your bathroom. However, for the space where the shower is located, it is recommended to pick moisture-resistant drywall or green board.

When to put a vapor barrier on the ceiling?

Should you put a vapor barrier on the ceiling? Plastic vapor barriers should only be installed in vented attics in climates with more than 8,000 heating degree days. All attics — vented or unvented — should have an air barrier (a properly detailed airtight drywall ceiling , for example) regardless of climate.

Can a vapor barrier be installed in a vented attic?

Plastic vapor barriers should only be installed in vented attics in climates with more than 8,000 heating degree days. You can forego the plastic and use a vapor retarder (kraft-faced insulation or latex ceiling paint) in all other climates except hot-humid or hot-dry climates.

Can a vapor barrier be used on wood framing?

With fiber insulation and a vapor barrier, moisture can get trapped in the insulation leading to moldy insulation and decay in the wood framing. With 2 in. of foam against the wall, this should not be a problem in your climate. The foam layer should be continuous and sealed at joints to keep indoor air away from the concrete.

Can a vapor barrier be used against concrete?

With 2 in. of foam against the wall, this should not be a problem in your climate. The foam layer should be continuous and sealed at joints to keep indoor air away from the concrete.

Do you vapour barrier ceiling or walls first?

Jim Brown

Do you vapour barrier ceiling or walls first?

To start installing poly it does not really matter if you do the walls or ceiling first but I prefer to do the walls in a room first. So to do the walls start by deciding how big of a piece you can handle and cut if from the roll. I would start with about a 8 foot piece until you do one to make it easier.

Do you put vapour barrier on inside walls?

Installing a vapor barrier on the (warm) interior wall of your cement brick house will prevent condensation and reduce air leakage through your walls and insulation. Because no vapor barrier can be perfect, and some water may still get in, you must create a venting path for the water to get through the insulation.

Does vapor barrier go before or after insulation?

After the insulation is in place you will want to add a vapor retarder, sometimes called a vapor barrier, if you need one. Not every wall does. A vapor retarder is a material used to prevent water vapor from diffusing into the wall, ceiling or floor during the cold winter.

Where to place a vapor barrier in a house?

The placement of the vapor barrier depends largely on the climate where your house is. In warm climates, the barrier should point to the outside of the house, blocking the vapor from the humid outside air that may seep into the walls or ceilings.

What happens when you put a vapor barrier in your car?

A vapor barrier reduces the movement of water vapor by diffusion. Holes in the vapor barrier that allow humid air through may allow a lot more water vapor into an assembly than the vapor barrier is stopping. Because of this, air sealing is more important than vapor retarders.

Is it OK to put a vapor barrier in your air conditioner?

If you’re in Maine and never use an air conditioner, a vapor barrier on the inner surface may be OK. If you’re in a cold climate, however, and do use air conditioning, you need to be careful with interior vapor barriers like polyethylene. You could be creating the kind of problems I described in scenario 1 above.

What happens when you put a plastic vapor barrier in your wall?

Plastic on the outer surface of a wall in cold weather could cause problems. The humid air is indoors. The cool surface is the sheathing, assuming no exterior insulation. If water vapor diffuses or infiltrates into the wall cavity and finds the cool surface, moisture problems can occur.

https://www.youtube.com/watch?v=XkJFpocRj8s