Quick Answer: Do You Put Plastic Over Faced Insulation?

Should you put plastic behind drywall?

The standard installation of a plastic vapor barrier is between the studs and the drywall, but there are some exceptions to this.

In exterior walls that are below-grade, like basement walls, plastic should not be used at all.

Some applications require a different use of plastic vapor barriers..

How much does it cost to replace a vapor barrier?

Crawl Space Vapor Barrier Cost A crawl space vapor barrier costs $0.15 to $0.50 per square foot on average, depending on the thickness of the plastic, which ranges from 6 to 20 millimeters. An average vapor barrier installation costs $2 to $4 per square foot or between $1,200 and $4,000 for materials and labor.

Does faced insulation act as a vapor barrier?

There are two basic types of vapor barriers used with exterior wall insulation. The most common is paper-faced insulation. … The insulation is installed into the wall cavity with the paper facing into the house. This is very important — the paper, which is the vapor barrier, always faces the warm side of the house.

Do vapor barriers cause mold?

The Problem With Vapor Barriers This can lead to significant moisture problems and mold; problems occur when walls get wet during construction or more often throughout the home’s life. These wetting cycles can be from air flow, window leaks, pressure imbalances, and a host of lifestyle issues.

How thick should vapor barrier be?

6 milVapor 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.

What is the purpose of faced insulation?

Faced insulation has a vapor barrier or a vapor retarder (the facing) that helps prevent moisture from moving from one space to another. The facing also helps protect the surface, hold the insulation together and fasten the material to building components.

Can new vapor barrier go over old?

When you can’t remove the old plastic, you can go ahead and cover it. Just be sure it doesn’t lead to too much excess material for the replacement. When you install a vapor barrier that has wrinkles or raised portions it is more vulnerable to tears.

When should I replace my vapor barrier?

A severe rodent infestation can be cause for removal and replacement of your home’s vapor barrier. … On some occasions, it becomes necessary to remove and replace both the vapor barrier and sub-floor insulation to eradicate a rodent infestation and to decontaminate the area.

How long does a vapor barrier last?

20 yearsWhile thinner plastic or regrind may be okay for short-term use, only reinforced virgin poly should be used for long-term applications like crawlspace vapor barriers. Properly installed virgin reinforced poly should last 20 years or more in a crawlspace.

Should vapor barrier be taped?

Moisture resistance and protection Installing vapor barriers on wall surfaces is important to prevent moisture transfer and should always include sealing air gaps in walls, ceilings, and floor surfaces. … Vapor bond tape is essential in creating the most effective vapor barriers.

Should I use faced or unfaced insulation?

So in an attic the paper faces downward and in a crawl space, it faces upward. Unfaced insulation—the type without paper—is what you would use if you are adding insulation to your attic or to place between floors when living space is above and below.

Can you put plastic over Kraft faced insulation?

More than likely, installing an additional layer of poly over kraft facing won’t cause any problems — it’s no more risky than if the wall had only unfaced batts and poly — and the risk of using poly on the interior is relatively low in a cold climate like New York’s.

Do you need to cover insulation?

Is Exposed Insulation Unhealthy? … In this case, even if you don’t plan on completely finishing the basement, you should cover the exposed fiberglass insulation for safety reasons, including: Disturbing fiberglass insulation can send particles into the air that act as lung, eye, and skin irritants.

Where should vapor barrier be placed?

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. In cold climates like Canada, for most of the year the vapor barrier should be on the inside of the insulation.