Attic Insulation Cellulose R Value

By today s standards most homes built more than 10 years ago can be considered under insulated.

Attic insulation cellulose r value.

This calculator is to be used as an estimating tool only. Recycled glass or sand that s melted and spun into fibers. 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. Your home s age if your home is more than 10 year old you likely need more insulation.

How much is enough. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. The common denominator among varieties of insulation is the r value. Square feet of house or area to be insulated current and desired r value for insulation and type and cost of your energy.

A professional contractor or existing energy codes will provide the right r values for you depending on your home s climates. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Cellulose insulation has a baseline r value of 3 8 per inch. Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics.

As a benchmark one inch of solid wood has an r value of 1. 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. 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. Where you live different climates require different insulation r values.

Click the button to calculate the approximate r value for this job. The r value of loose fill cellulose is r 3 2 3 8 per inch. Achieving greater r values in exterior walls. There are many ways to retrofit a home with fiberglass and.

The higher the r value the better the thermal performance of the insulation. Input depth of existing blown in insulation in inches. Enter your data into the fields where indicated. 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.