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How thick does blown insulation need to be?
about 7.5 inches
When blown into attics and wall spaces, loose-fill fiberglass offers an average R-2.5 thermal value per inch (the higher the number, the greater the insulating effect). You’d need a thickness of about 7.5 inches of insulation to match the insulating value of a batt of R-19 insulation (R-19 is a common batt value).
What happens if you don’t have enough insulation in attic?
Finishing your attic is a great way to increase your home’s value. Even if you don’t use your attic at all, insulation helps keep the heat or cold in, so your bills won’t be so high. Without insulation, the heat from your heating system, or the cold from your air conditioner, will escape from the attic.
How do you calculate blown insulation?
Cellulose blow-in insulation is constructed out of recycled paper. To determine how much cellulose insulation you need, take the square footage of the space and divide it by either the depth or the desired R-value. Fiberglass blow-in insulation is essentially made up of spun fibers from recycled molten glass.
How much insulation do you need in your attic?
In Zone 4, the average minimum requirement for attic insulation is 11 inches of R38 fill. The average recommended level is 17 inches of R60. How much insulation in attic for Zones 5-7?
What are the pros and cons of blown in attic insulation?
Blown-In Attic Insulation 1 This type of insulation requires professional installation. 2 Installation projects can be very messy. 3 The weight of blown-in cellulose can cause ceiling sag. 4 Damp blown-in insulation can promote fungal growth. 5 The material becomes very problematic when wet.
What is the are value for attic insulation?
This measurement is described as R-Value. Generally speaking, a higher R-value means better insulating properties. The recommended R-value for attic insulation in Ontario is between R-50 and R-60. The two distinct types of attic insulation are loose-fill material (also commonly known as blown in insulation) and batting.
How much insulation should I put on my roof in Canada?
Here is a precise list of the R-Values necessary for the insulation of roofs in Canada, with related types of better insulation. The R Value is increasing, so the higher it is, the more thermally insulated your home will be. Zone 4 and Zone 5: R-Value recommended from R40 to R60, with Batt or Blown Insulation.