Blown-in insulation refers to blowing or spraying insulation product into wall cavities, attics, and floors. Methods vary depending on the form of insulation selected. Loose-Fill Fiberglass. In its loose-fill form, fiberglass is made from glass that is blown or spun into fibers. It is installed using a blowing machine.
Can you put insulation over existing insulation?
According to ENERGY STAR®, you can put new insulation over old insulation, “unless it is wet. The vapor retarder on top of or between layers of insulation can trap moisture. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.
How much insulation should you have in your attic?
Insulation levels are specified by R-Value. R-Value is a measure of insulation’s ability to resist heat flow. The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.
Is cellulose bad for your health?
There are no known harmful side effects from adding it to food, and it’s completely legal. “Cellulose is a non-digestible plant fiber, and we actually happen to need non-digestible vegetable fiber in our food—that’s why people eat bran flakes and psyllium husks,” says Jeff Potter, author of Cooking for Geeks.
Do it yourself attic insulation?
If you need to add insulation in your attic, save big by blowing in cellulose insulation yourself. The pros charge $1,500 to $2,000 to do a 1,200-sq.-ft. house. You can do it yourself for about $500. Blowing attic insulation isn’t hard, but it’s dusty, sweaty work.
What is blown in insulation made out of?
Cellulose is composed of 75-85% recycled paper fiber, usually post-consumer waste newsprint. The other 15% is a fire retardant such as boric acid or ammonium sulphate. Cellulose has the highest recycled content of any insulation available. For example, fiberglass has a maximum amount of 50% recycled content.
Can you insulate roof rafters?
First, always place the insulation tight to the living space. The insulation should not be installed in the roof rafters unless the ceiling finishes are applied directly to the roof rafters. Unfinished attic storage areas are cold in winter. There is no advantage in insulating a cold attic from the cold outdoors.
How much does it cost to have insulation blown in?
Blown-In Fiberglass Insulation CostsR-ValueBags Per 1,000 Sq. Ft.Material CostR-3015$495R-3820$660R-4423$759R-4926$858
Can cellulose insulation contain asbestos?
Cellulose has a high recycled paper content, no minerals. Close examination will show that this puffy gray material does not contain earth minerals at all, but will look like shredded gray paper. Cellulose insulation is a perfectly safe type of insulation that is blown into the cavities between the joists.
What is the best insulation for your attic?
If you don’t have HVAC and ducts in the attic, spray foam on the roofline isn’t really necessary. I’d blow insulation on the attic floor (after air-sealing, of course). The big disadvantage with spray foam is cost. It’s generally 3 to 4 times what you’ll pay for blown cellulose or fiberglass.
Is cellulose insulation harmful?
Conscious or unconscious eating of cellulose insulation could result in death because of its highly poisonous chemical additives (i.e. borates and boric acid). Deadly toxins can also get into your body though a cut or lesion on the skin. Symptoms of poisoning include severe abdominal pain and inflammation of the skin.
What is the R value of blown in insulation?
Fiber glass insulation typically contains 20% to 30% recycled glass1. The R-value of loose fill cellulose is R-3.2 to 3.8 per inch2. Loose fill fiberglass has an R-value of R-2.2 to 2.7 per inch3. Achieving the desired R-value depends on both the depth of the insulation and its density.
How do you calculate blown in insulation?
Enter the dimensions of your attic.
Measure the depth of your existing insulation and enter this number below. Current Depth: in. Current Insulation Type: Fiberglass Cellulose.
Determine Your Desired R-value. Estimated Current R Value: Your Desired R Value:
Enter the dimensions of your attic. Width: ft. Length: ft.
What R value do I need for attic?
Recommended insulation levels for retrofitting existing wood-framed buildingsZoneAdd Insulation to AtticUninsulated AtticExisting 3–4 Inches of Insulation3R30 to R60R25 to R384R38 to R60R385 to 8R49 to R60R38 to R49
What is the R value of insulation?
At the technical level, R-value is a measure of resistance to heat flow through a given thickness of material. In theory, the higher the R-value, the greater that resistance. That’s true to a point, but it’s just one of four key factors that determine the effectiveness of an insulation material.
What is air sealing an attic?
Seal small gaps. Even though most of the gaps spilling warm air into your attic are buried under insulation, you might be able to find evidence of them. Use expanding foam or caulk to seal the openings around plumbing vent pipes and electrical wires.
What is attic insulation made of?
The most common types of materials used for loose-fill insulation include cellulose, fiberglass, and mineral (rock or slag) wool. All of these materials are produced using recycled waste materials. Cellulose is primarily made from recycled newsprint. Most fiberglass products contain 40% to 60% recycled glass.
What color is cellulose insulation?
The main differences between fiberglass and cellulose insulation are: Organic vs. synthetic materials. Color (fiberglass is pink and cellulose is more neutral in color – usually a grayish white)
What is blown in fiberglass insulation?
Blown-in Insulation: Fiberglass vs. Cellulose. Blown-in insulation is one of the most cost-effective insulation solutions that homeowners canchoose from. The process of installing blown-in insulation is a relatively easy way to insulate your roof and attic.
What is the use of fiberglass insulation?
Fiberglass Insulation: History, Hazards and Alternatives. by Nick Gromicko and Kenton Shepard. Fiberglass is a type of fiber primarily composed of glass that is used in a wide variety of applications, and is predominantly employed as a residential and commercial thermal insulator.
What is loose fill insulation?
BLOWN-IN OR LOOSE-FILL CELLULOSE. For many green builders, cellulose is the first insulation choice for above-grade walls and ceilings. It is environmentally friendly, is inexpensive, and performs well. Cellulose insulation is blown in place, so it does a better job at filling cavities completely than fiberglass batts.