Attic Insulation Cellulose R Value

Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics. Recycled glass or sand that s melted and spun into fibers. Input depth of existing blown in insulation in inches.

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How much is enough.

Attic insulation cellulose r value.

Enter your data into the fields where indicated. Your home s age if your home is more than 10 year old you likely need more insulation. 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. Use this insulation savings calculator to measure the financial impact of increasing your insulation performance.

In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. As a benchmark one inch of solid wood has an r value of 1. When installing cellulose in your home the highest r value or installation depth is not necessarily the best. Cellulose insulation has a baseline r value of 3 8 per inch.

The common denominator among varieties of insulation is the r value. A professional contractor or existing energy codes will provide the right r values for you depending on your home s climates. Square feet of house or area to be insulated current and desired r value for insulation and type and cost of your energy. By today s standards most homes built more than 10 years ago can be considered under insulated.

There are many ways to retrofit a home with fiberglass and. Lighter in weight than cellulose or mineral wool but it settles more than those materials so you ve got to put in a thicker layer to get the protection you need. This calculator is to be used as an estimating tool only. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

The higher the r value the better the thermal performance of the insulation. Click the button to calculate the approximate r value for this job. Achieving greater r values in exterior walls. Where you live different climates require different insulation r values.

The r value of loose fill cellulose is r 3 2 3 8 per inch. Average ratings the r value for cellulose insulation in an attic depends on several factors including the size shape and construction of your attic typical weather conditions where you live any. You can achieve better thermal performance in your attic by adding an additional layer of insulation. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

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