Attic Insulation Depth

Click the button to calculate the approximate r value for this job.

Attic insulation depth.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. The attic is the easiest place to add insulation to improve your comfort and the energy efficiency of your home. Now that you ve air sealed your attic and basement check your attic insulation levels and add more if necessary. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

R 38 is the industry standard and the minimum thickness for r 38 is 12 inches. It works best for. If your current insulation is only 5 inches deep you ll need to add seven inches of insulation to achieve the 12 inch r 38 rating. Input depth of existing blown in insulation in inches.

You can pour the fill in place and spread it manually but the process is much more labor intensive and the results won t be nearly as good. Insulation fibers are packaged in bags and blown in place to the desired depth and density using special machinery you can rent from a home center. If you think you re among the 90 of us homes that are under insulated 1 performing a simple insulation inspection will help you determine your insulation needs. 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.

Bag of all borate contractor grade 30 lb. Please enter depth in inches please enter depth in inches. For loose fill cellulose this translates to a total depth ranging from 8 inches. Having the correct amount of attic insulation can help you maintain a comfortable temperature throughout your home and help save money on your energy bills plus prevent major issues like ice dams in the winter.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. Insulation level are specified by r value. Calculate additional insulation needed.

This calculator is to be used as an estimating tool only. Shop insulation accessories. Bag of all borate insulation is ideal for professional contractors that offer blow in attic sidewall and floor applications. 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 your attic to reach r 30 if you live in zones 2 or 3.

Measure the depth of your current insulation. Greenfiber cellulose insulation fills gaps and voids to create an energy saving thermal blanket that can lower heating and cooling costs by 25 and reduce sound power by 60. The higher the r value the better the thermal performance of the insulation.