R Factor In Attic Insulation

To choose the best insulation for your home from the many types of insulation on the market you ll need to know where you want or need to install the insulation and what r value you want the installation to achieve. Input depth of existing blown in insulation in inches. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.

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

R factor in attic insulation.

Click the button to calculate the approximate r value for this job. It s all about heat. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Insulation has nothing to do with keeping cold out or in.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Other considerations may include indoor air quality impacts life cycle costs recycled content embodied energy and ease of installation especially if you plan to do the. This calculator is to be used as an estimating tool only. The table below shows what levels of insulation are cost effective for different climates and.

The laws of physics tell us that heat energy is in constant motion from a hotter. R value is a measure of insulation s ability to resist heat traveling through it. Determining r factor in an attic. 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.

Recommended home insulation r values. The higher the r value the better the thermal performance of the insulation. Insulation level are specified by r value.