What side of wall does vapor barrier go?

Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions: the inner surface in colder climates and the outer surface in hot, humid climates. In existing spaces, oil-based paints or vapor-barrier latex paints offer an effective moisture barrier.
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What side of the insulation does the vapor barrier go?

In order to prevent condensation from forming, a vapor barrier should be placed on the warm side of your insulation to stop warm, moist air from condensing on a cold surface inside your wall.
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Can you vapor barrier both sides of a wall?

Joe Lstiburek, an engineer and principal with Building Science Corp. in Westford, Mass., responds: Installing a vapor barrier on both sides of a wall is never a good idea in any climate. In the Houston climate, a vapor barrier should be located on the exterior, so your choice of exterior foam sheathing was a good one.
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Do you install the vapor barrier on the inside or the outside of the wall?

Wall Location

In general, vapor barriers are going to be installed in exterior walls, where the inside of the building is on one side, and the outdoors is on the other side of the wall.
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Where does a vapour barrier go in a stud wall?

In an ideal scenario, the VCL would be placed to the top side of the joists before boards are laid. The insulation would be below this, meaning that the VCL is on the warm side of the insulation. This would then stop warm, moist air from entering the structural elements.
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Vapour barriers for roofs and walls explained



Do I need a vapour barrier on a stud wall?

Your first job after the studs are in place is to fill those walls with insulation. If you are not sure if you need insulation in your walls follow along with this flow chart. After the insulation is in place you will want to add a vapor retarder, sometimes called a vapor barrier, if you need one.
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How do you attach vapor barrier to a wall?

Put up the wall plastic

Stick the vapor barrier material to the foundation seal tape and then use mechanical fasteners to hold it forever. Drill holes through the plastic and through the seal tape into the block. If you drill through the seal tape you will prevent the plastic from peeling off when you remove the drill.
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Should I staple vapor barrier?

Tug and smooth the vapor barrier to ensure a completely smooth surface lacking wrinkles or gaps through which moisture and air may escape, defeating the vapor barrier's purpose. Staple through the plastic into the sole plate -- the horizontal board running under the studs – at bottom.
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Where do you staple a vapor barrier?

The vapour barrier always goes on the warm side of the wall between the framing and the drywall. The secondary function is that it stops the infiltration of cold air from coming through the wall cavity into your home.
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Can I use plastic sheeting as a vapor barrier?

Reinforced polyethylene plastic sheeting (poly) comes in a variety of thicknesses and strengths. A 6 mil thick poly is commonly used as a vapor barrier and offers short-term savings to the homeowner.
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What happens if you put a vapor barrier on both sides of insulation?

Putting the vapor barrier on the outside will cause condensation in your wall.
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What is the difference between a moisture barrier and a vapor barrier?

Moisture barriers function to help in preventing water from entering inside of the wall cavity. On the other hand, vapor barriers basically prevent water vapor from the interior of the house to filter through the wall and condense on the warm side of the insulation.
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Do you put a vapor barrier on the ceiling?

It is essential to have a vapor barrier installed with your ceiling insulation. It's not uncommon for moisture and dew to form on a ceiling because of the temperature differences; moisture can cause mold and rot if left unchecked.
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What happens if insulation is installed backwards?

So if it is installed upside down, the paper moisture barrier can actually keep moisture in-between the paper and the sub-flooring. This can lead to mold issues, as well as structural deterioration. Also, the paper is flammable so not properly installing it can create a fire hazard.
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Does it matter which way insulation faces?

Regardless of whether fiberglass insulation is installed in a wall, attic, or crawlspace; the paper facing should always face toward the inside of the home. That's because the paper contains a layer of asphalt adhesive which prevents water vapor from passing through it.
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Should I put plastic behind drywall?

Without poly beneath the drywall, water vapor hits the drywall and diffuses through to the drier (in summer) indoor air. By installing a sheet of poly there, you cut off that drying mechanism and water that finds its way into walls can stay there longer and do more damage.
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Can you use 4 mil plastic for vapor barrier?

OVERVIEW. Our 4-mil plastic sheeting is a multipurpose film perfect for a wide variety of construction or DIY projects. This medium-duty plastic sheeting is commonly used as a vapor barrier in between insulation and drywall, used as a drop cloth or a temporary cover for equipment and supplies.
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Can I install vapor barrier myself?

Provided you're not claustrophobic, installing a vapor barrier is a project most homeowners can DIY. You will need to calculate the square footage of your crawl space, so you can buy the appropriate amount of liner.
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Is Tyvek a vapor barrier?

Is DuPont Tyvek® a vapor barrier? No, DuPont Tyvek® is not a vapor barrier. It is made with unique material science to keep air and bulk water out while allowing moisture vapor inside walls to escape.
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How thick should wall vapor barrier be?

Vapor barriers should be at least 6 mil in thickness to effectively cover the area and create a moisture barrier. Triangle Crawl Space Solutions uses both a 6 mil material for simple vapor barrier installation and a thicker more durable 12 mil vapor barrier material depending on the budget and needs of the home.
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Do you tape the edges of vapor barrier?

Vapor seal tape with marked edges tears easier and applies quicker, saving workers frustration and time. A flexible tape also hastens the application because it permits workers to seal quickly around any penetrations or tight corners.
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What kind of tape do you use for vapor barrier?

Builders that use acrylic tape to seal the seams of a vapor barrier ensure a tight building envelope. A tightly sealed building envelope reduces energy use and moisture intrusion, which prevents the growth of mold.
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Can you glue vapor barrier?

You have a variety of options for vapor barriers. Two of the most common are polyethylene sheeting and rigid foam insulation. Both glue to the cement easily and install quickly.
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Where does the vapour control layer go?

A vapour control layer is typically installed on the internal side of the insulation to control the passage of warm moist air (water vapour) entering the structure.
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