Fiberglass Attic Insulation 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.

Fiberglass attic insulation r value.

First you ll need to determine your r value. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. One bag of attic protector provides 62 square feet of r 30 coverage. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

These products provide a high r value inch excellent sound attenuation characteristics and outstanding fire performance. Installed with a portable blowing machine it s perfect for covering hard to reach areas within attics and provides a more efficient installation for homeowners or remodeling. The table below shows what levels of insulation are cost effective for different climates and. Insulation level are specified by r value.

Use the energy code map to help determine r value for your region. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. We ll walk you through the steps to help you find the right type of fiberglass attic insulation and the right amount. The higher the r value the better the thermal performance of the insulation.

Input depth of existing blown in insulation in inches. Installing fiberglass attic insulation first time adding insulation to an attic. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. As a benchmark one inch of solid wood has an r value of 1.

Spray foam pink fiberglas vs. This calculator is to be used as an estimating tool only. Where you live different climates require different insulation r values. Insulation project calculator how to install naima r value certification product training videos colab learning video library for pros distributor locator why owens corning insulation propink vs.

Warmer climates only require an r 38 or higher or about 12 or more. Your home s age if your home is more than 10 year old you likely need more insulation. Thermafiber residential mineral wool insulation commercial grade at home thermafiber residential mineral wool blankets are ideal for insulating walls floor ceilings and attic spaces in homes. Johns manville attic protector formaldehyde free premium blow in fiberglass insulation offers effective thermal and acoustical performance.

Recommended home insulation r values. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.