# How much coverage is in a bag of insulation?

ft.

## How much dense pack do I need?

The recommended dense-packed density for cellulose is 3.5 to 4.5 lb/ft3 (56 to 72 kg/m3) and for fiberglass 1.8 to 2.6 lb/ft3 (29 to 42 kg/m3). Installing dense-pack insulation properly requires the proper knowledge and “feel”, this only comes from experience.

How many bags of insulation do I need per square foot?

If you’re aiming for R-30 (a common recommended value for attics per the Home Depot chart), the GreenFiber chart gives 40.8 bags per 1,000 square feet of gross coverage. Divide the measured square footage you obtained by 1,000 square feet to obtain the multiplication factor: 1,500 square feet/1,000 square feet = 1.5.

How many cubic feet are in a bag of insulation?

Area coverage values per bag are dependent on the package size. Length = 10 ft–width = 6 feet–bag coverage= 16.5 cubic ft–R value per 1″ = 3.6–required R val.

### How do you calculate cellulose insulation needed?

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.

### How many inches is R44?

Fiberglass Chart

R-Value Thickness Bags / 1000 Sq Ft
R49 16.25” 22.6
R44 14.75” 20.1
R38 12.75” 16.8
R30 10.25” 13.0

How big is a bag of cellulose insulation?

To get the marked R-value, it is essential that this insulation be installed properly. This coverage chart is based on settled thickness, a nominal bag weight of 30 lbs and coverage based on the Krendl KS200 blowing machine.

How do you calculate R-value of insulation?

It is simply the thickness of the insulation in inches divided by the thermal conductivity of the insulation. For example, a two inch thick sheet of insulation with a thermal conductivity of 0.25 Btu•in/h•ft2•°F has an R-value equal to 2 divided by 0.25 or 8.0.