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Vapor Barrier Installation Cost

Vapor Barrier Installation Cost A vapor barrier is a high-density material (typically a plastic or foil sheet but sometimes a paint-like coating) used to prevent water vapor from moving from one area to another, Vapor Barrier Typical costs: Vapor Barrier Vapor retarder paint costs about $20 -$40 a gallon or $60 -$90 for a five-gallon pail. For example, Sherwin Williams Master Touch Latex Vapor Barrier Primer sells for about $80 for a five-gallon pail.

Vapor Barriers Cost

A vapor barrier is a high-density material (typically a plastic or foil sheet but sometimes a paint-like coating) used to prevent water vapor from moving from one area to another, where it can create problems with mold, rot, odors or bugs. Vapor barriers can be used in tandem with insulation in walls, in an attic, in a crawlspace or basement, under a concrete slab, over a concrete subfloor before installing wood or laminate flooring, or anywhere it's necessary to reduce the amount of water vapor that passes through. Most materials commonly referred to as vapor barriers are actually vapor diffusion retarders, because they limit the amount of water vapor passing through, but no material can block it completely.

Typical costs:

  • Vapor retarder paint costs about $20 -$40 a gallon or $60 -$90 for a five-gallon pail. For example, Sherwin Williams Master Touch Latex Vapor Barrier Primer sells for about $80 for a five-gallon pail. Vapor barrier paint is usually white and used as an undercoat primer. It varies by brand, but generally one gallon will cover about 300-400 square feet; a five-gallon pail will cover 1,500-2,000 square feet. Vapor retarder paint is not as effective as a plastic or foil sheet and any damage to the painted surface reduces its ability to reduce the amount of moisture getting through.
  • Rolls of basic clear or black polyethylene plastic sheeting thick enough (usually single ply and at least 6-mil thick ) to be used as a vapor barrier --in walls, flooring, ceilings or under concrete slabs, start around 5 cents to 20 cents per square foot, or $75 -$300 for 1,500 square feet. This basic plastic sheeting still allows some water and vapor to pass, and tends to tear easily. Thicker (8-mil to 23-mil), multi-ply vapor barriers (often designed for specific uses, such as under concrete slab or between new wood flooring and a concrete subfloor) can cost 25 cents to $1.50 a square foot, or $375 -$2,250 for 1,500 square feet. In many cases these vapor barriers are installed as part of a larger project; if done by a contractor, the vapor barrier will be included in the overall cost. The Energy Efficiency Manual gives an overview of vapor barriers and illustrates the installation of clear poly as a vapor barrier in the new construction of a large master bedroom.
  • Another common usage of a vapor barrier, especially in the Southeast and Northeast, is in the crawlspace under a home. This involves laying flat polyethylene plastic of at least 6-mil, on the crawlspace floor, with about 6 inches extending up the walls. All seams are sealed with special tape. Do-it-yourself materials for a 1,500-square-foot crawlspace start around $100 -$400 for basic supplies, and go up for higher-quality materials designed specifically to be used as a vapor barrier. The U.S. Department of Energy recommends using 6-mil polyethylene, overlapping all seams by at least 12 inches, taping all seams and sealing the poly 6 inches up the crawlspace walls, with an optional 2 inches of concrete poured over the poly. Hiring someone to install this in a 1,500-square-foot crawlspace could cost $1,000 -$3,000 or more for labor and materials.
  • Crawlspace encapsulation uses a multi-layer 20-mil vapor barrier to completely cover the floor and and walls, while also sealing all crawl space vents and openings, and adding a dehumidifier or sump pump if needed. The total cost with installation is $3,000 -$15,000 or more. See How Much Does Crawlspace Encapsulation Cost.

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