Attic Insulation Cellulose R Value

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. Recycled glass or sand that s melted and spun into fibers. Your home s age if your home is more than 10 year old you likely need more insulation.

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As a benchmark one inch of solid wood has an r value of 1.

Attic insulation cellulose r value.

By today s standards most homes built more than 10 years ago can be considered under insulated. 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. Enter your data into the fields where indicated. Square feet of house or area to be insulated current and desired r value for insulation and type and cost of your energy.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. A professional contractor or existing energy codes will provide the right r values for you depending on your home s climates. This calculator is to be used as an estimating tool only. Achieving greater r values in exterior walls.

When installing cellulose in your home the highest r value or installation depth is not necessarily the best. Click the button to calculate the approximate r value for this job. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. 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.

Where you live different climates require different insulation r values. How much is enough. Cellulose insulation has a baseline r value of 3 8 per inch. You can achieve better thermal performance in your attic by adding an additional layer of insulation.

There are many ways to retrofit a home with fiberglass and. Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics. The common denominator among varieties of insulation is the r value. 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.

The higher the r value the better the thermal performance of the insulation. Use this insulation savings calculator to measure the financial impact of increasing your insulation performance. Input depth of existing blown in insulation in inches. The r value of loose fill cellulose is r 3 2 3 8 per inch.

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