Attic Insulation Cellulose Thickness

R 38 is the industry standard and the minimum thickness for r 38 is 12 inches.

Attic insulation cellulose thickness.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. Loose fill cellulose is relatively inexpensive yet still has an r value of about 3 5 per inch of thickness compared to fiberglass r value between r3 to r4 per inch. You d need a thickness of. Measure the area needing insulation.

Cellulose will settle after installation creating a dense continuous layer helping to block air transfer through any holes into your attic. They come with or without a paper or foil facing that acts as a vapor barrier. Insulation level are specified by r value. The cellulose insulation method creates lots of dust but it gets the job done.

If you hire a pro they use wet spray cellulose which adds a small amount of water to help control the dust and to slightly increase the insulation value per inch. Inspecting your attic insulation. If your current insulation is only five inches deep you will need to add seven inches of insulation to achieve the 12 inch r 38 rating. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.

R value is a measure of insulation s ability to resist heat traveling through it. 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. This flexible insulation material is most often packaged in rolls that come in various thicknesses and standard widths usually 16 inches and 24 inches to fit between joists or studs in a house s framing. Cellulose provides an r value of approximately 3 5 per inch.

It is pulverized into a fine powder that adheres and remains a part of the insulation. The higher the r value the better the thermal performance of the insulation. Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics. The two main least expensive and most commonly used residential insulation materials is cellulose and fibreglass.

The cellulose product home comfort insulation uses is treated with 100 borate fire retardant formula. In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. Unless you opt for spray foam then the insulation choices normally come down to cellulose and fibreglass.