The best plastic to cover insulation depends on your project, but a 6-mil polyethylene (poly) sheeting is the industry standard for most interior walls and ceilings. For crawl spaces or high-durability areas, reinforced polyethylene or 10+ mil plastic is highly recommended.
However, most fiberglass and batt insulation require a separate insulation cover or vapor barrier. Insulation materials are typically thick and fibrous. Common types include fiberglass, mineral wool, and foam. Vapor barriers, by contrast, are thin plastic sheets—usually polyethylene starting at 6 mil thickness.
PIB (Polyisobutylene) can also be used over fiberglass insulation. PIB is a type of vapor barrier that is designed to prevent moisture from penetrating through walls, ceilings, and floors. It is commonly used in basement and crawlspace applications to help prevent moisture damage to insulation and building materials.
In new construction, or in remodeling projects in which the existing windows will be replaced, the DuPont™ Tyvek® WRB can be installed under or over the DuPont Exterior Continuous Insulation based on whether the windows will be aligned with the exterior finished wall or recessed from it.
Acrylic: Excellent optical clarity, insulation, and weather resistance. Acrylonitrile Butadiene Styrene (ABS): Good dielectric strength, impact resistance, and affordability. Nylon: High durability, heat resistance, and wear resistance. Polycarbonate: Superior impact strength, flame retardance, and UV resistance.
In basements, installing a vapor barrier on the interior wall in front of the insulation and behind the drywall will keep the basement temperature consistent and protect its contents from water vapor damage.
Foam Board or Rigid Foam
Foam boards -- rigid panels of insulation -- can be used to insulate almost any part of your home, from the roof down to the foundation. They are very effective in exterior wall sheathing, interior sheathing for basement walls, and special applications such as attic hatches.
ZIP System® tape is prone to stress and tears at inside corners, creating yet another place for air and water to get into the wall. Tyvek® HomeWrap® folds easily into corners—forming a continuous barrier against air and water infiltration.
Plastic Degrades When Exposed to Repeated Heat
This is especially true of plastic sheeting installed under siding on south-facing walls. It's likely to become brittle in just a few years.
Disadvantages of Tyvek® House Wrap
Tyvek® House Wrap has a tensile strength of only 30/30 lb/in. So, after installation, but before the exterior cladding and final fasteners, Tyvek® House Wrap may be susceptible to damage due to high winds and moisture exposure.
Any plastic sheet that will be acting as a vapour retarder should be to the warm side of your insulation. Don't put down poly without any insulation, it will just create a condensation problem.
Mice are curious and always searching for safe, snug, and warm nesting sites. Attics filled with blown-in insulation provide an excellent option–from the mice's point of view. As long as there is a ready food source. Mice are omnivorous and will eat and chew on almost anything including wood and electrical wires.
No, not recommended at all. A vapor barrier repells water but lets air pass through so if the sheeting gets wetit will evaporate. Painters plastic tarps would be more of a water and air barrier, trapping moisture and promoting condensation---even promoting mold growth and wood rot.
The best solutions to use in these applications are either a Vapor Barrier or a Radiant Barrier. Most climates require a vapor barrier to cover ceiling insulation, but not all insulation requires a vapor barrier. It's always important to refer to your state's building codes.
4 MIL - Heavy duty protection when packaging nails, screws & heavy metal parts. 6 MIL - Extra heavy duty protection against punctures and tears on bulky items or items with sharp corners.
No you must remove it. Covering it with plastic will only trap moisture and will make it worse. You must first handle the moisture issue, very likely a roof leak or leaks. Check any roof penetrations such as the vent stack or chimney.
Clear Plastic Sheeting is a general-purpose plastic film for use in a variety of construction and DIY applications. This sheeting can be used as a vapor barrier in between drywall and insulation. Also commonly used as a drop cloth or a temporary cover for equipment and supplies.
Though the portable, cheap wrap keeps leftovers fresh for longer, there are several catches: Plastic wrap contributes to the larger plastic pollution crisis, it's difficult to recycle, and it's made from potentially harmful chemicals, especially as they break down in the environment.
Measured in g/m²/24 hours or g/100 in²/24 hours, the MTVR shows how much moisture can enter a plastic bag during one day. A low MVTR means very little moisture can enter so a barrier like aluminum foil laminate is down to 0.001 g/m²/24 hours and a normal LDPE bag might be as high as 16-23 g/m²/24 hours.
Stapling is the most common method of attaching Tyvek. Staples should be spaced 6 inches apart and driven into the studs or joists. Nailing is another option for attaching Tyvek. Nails should be spaced 12 inches apart and driven into the studs or joists.
In most cases, using ZIP System® sheathing on the roof eliminates the need for a roofing underlayment such as tar paper. ZIP System sheathing and tape key features and components include: High-performance engineered wood structural sheathing delivers Structural 1 shear strength and exterior durability.
Withstands up to four months (120 days) of UV exposure. Maximum in-service temperature of 180° F.
A: Options include spray foam, blow-in insulation (fiberglass or cellulose), foam boards for masonry walls, reflective foil, thermal wallpaper, and weather stripping for gaps around doors and windows.
For larger chases, use drywall, wood or rigid foam – and caulk or foam all around the edges. Seal the hole where the bathtub drain comes down – and any other holes for plumbing or electrical wiring in the basement ceiling – with caulk or foam.