Without Vapor Barrier Insulation You're Wet, Rotting, Moldy, Sagging and Cracking
Prodex Total Vapor Barrier Insulation protects your metal building, house and foundation from the damages caused by moisture.
The primary purpose of a vapor barrier is to keep moisture from getting inside your building, house and foundation. Moisture from the walls or roof can cause wood rot, mold, mildew, rust and fungus growth. Signs of moisture within the walls include blistering exterior paint and mildew stains on the walls. Signs of moisture in a metal building include sagging and cracking on the vinyl facing of old insulation.
What is a Vapor Barrier?
A vapor barrier (moisture barrier) refers to any material that prevents moisture from passing through the walls, roof or foundation.
Permeability (perms) refers to the measure of the rate of transfer of water vapor through a material. The lower the perm, the fewer the vapor that can pass through. Look for a vapor barrier with a perm of less than 1. Transmission rates are established by standard test methods. One common set of units is g/m²/day. or g/100in²/day. (1.0 US perm = 1.0 grain/square-foot·hour- inch of mercury ≈ 57 SI perm = 57 ng/s·m2·Pa).
Prodex Total Vapor Barrier Insulation - 13/64 inch, 5mm closed cell polyethylene foam covered on both sides with .0012-inch (00.03mm) aluminum foil facing. Prodex Total Insulation (Vapor Barrier, Class 1. perm<0.1 ). In addition to being a vapor barrier, it eliminates condensation, provides thermal protection and prevents radiant heat transfer.
Basements Need A Vapor Barrier Insulation Roll
The underground environment of walls below grade presents unique challenges. The moisture content in soil below three feet deep is almost always higher than the moisture content of the air inside. This difference in vapor pressure causes moisture to be driven from the soil into the basement or crawlspace interior by diffusion through the wall. A significant amount of moisture from the soil below the slab will wick upward into the basement through the slab.
Installing a Vapor Barrier On a Basement Wall
Install Prodex on the basement walls before framing. Add an additional layer of Prodex Total either between or under your framing to provide additional thermal protection.
Why use a board when you could use a roll?
You're better off with a roll because foam insulation board is rigid. Because it is inflexible, it does a poor job filling the gaps or cracks that may exist in your walls. As a result, you'll have air passage ways in and out of your home. Air traveling in an out will bring moisture with it. This can lead to a multitude of problems such as mold, mildew and rot.
A vapor barrier should be used under a slab-on-grade foundation or poured cement basement floor. Since a damp basement is one of the greatest producers of moisture (up to 50 lbs/day of vapor), the vapor barrier under concrete floor slabs and over earth floored crawlspaces are integral structural components of interior moisture control. Recommended vapor barrier insulation for under slab and radiant in floor heat: Prodex Total Under Concrete.
Prodex Total Under Concrete Vapor Barrier Insulation
Designed specifically for under concrete applications | Less than 9% compression in under concrete applications (4" slab) | Ideal for radiant heat floors | Can reduce heat loss by 56% | Eliminates dampness and condensation in concrete | Vapor barrier (per rating less than 0.1) | Radon barrier | Thermal break | Seals around nails
Metal Buildings Really Need Vapor Barrier Insulation
Condensation can be more significant problem in a metal building than temperature control. Moisture from condensation, rain and ground can create several problems in metal buildings. First, the presence or water or ice in the insulation seriously degrades both the thermal performance and service life of fiberglass, paper, wool and other traditional insulation materials. Second, water in contact with steel contributes to corrosion and lowers the service life of the building. Third, collection of water can lead to dripping, staining, mold, mildew and odors. All of the problems can be solved with properly installed vapor barrier insulation. Even in only moderately humid climates, condensation can cause serious problems in an unprotected metal building. Recommended vapor barrier and metal building insulation: Prodex Total Fast Action.
Final comments - A building vapor barrier must be continuous to work - no holes, leaks, un-taped seams or edges. Leakage will negate the effectiveness of the barrier. Any tears, openings, or punctures that may occur during construction must be completely sealed. Ending the vapor barrier at the floor or ceiling junction has the same effect as a large hole. To create the vapor barrier, the seam between the ceiling and wall must be sealed well. Think of your house or building as a large balloon with the vapor barrier as the skin of the balloon. A leaky barrier is not much better than no barrier at all. Prodex Total Insulation will keep heat and moisture in during the winter. It will keep heat and moisture out during the summer. It seals around punctures and it will not absorb moisture in the event of a water leak.
Updated April 14, 2015