Blown Attic Insulation Vapor Barrier

Fluffy bits of spun glass that are noncombustible and can t decay.

Blown attic insulation vapor barrier.

Handy homeowners can install blown in insulation in the attic. 70 to 75 per sq. Not every wall does. This worked well until we added large quantities of attic insulation.

But in some cases water vapor builds up in tight houses until it forces its way through the inside wall surface the vapor barrier and insulation hitting the back of the cool sheathing then. Attic vapor barrier detail for cold climates the best approach for a vented attic in a cold climate is installing a layer of drywall with a good coat of latex paint the paint creates a semi permeable vapor barrier. Hence the need to reduce moisture flow into the attic and the need for a vapor barrier. R value declines by as much as 50 percent at temps below 0 degrees f.

After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Insulation labs is a name to reckon with for efficient vapor barrier installation services. Blowing insulation into walls is best left to the pros because it involves drilling into stud spaces that may contain electrical. With our vapor barrier installation services there will be no issue of the crawl space of your home becoming a residence for pests bats and rodents.

Some regions don t require a vapor barrier. Attic insulation new construction or retrofit work. Do not add a vapor barrier on top of the insulation in your attic since the paper facing on the existing insulation is the vapor barrier. Whether using loose fill or batts put the vapor barrier closest to the warm side of your installation where hot moist air would get in facing the house s interior in cold climates beneath floor insulation and the attic s interior in hot climates on top of floor insulation.

The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. The paper facing contains a layer of impermeable asphalt that prevents water vapor from passing through it.