How Many Inches Of Insulation In The Attic Equals R45

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.

How many inches of insulation in the attic equals r45.

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. 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. As a benchmark one inch of solid wood has an r value of 1. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Input depth of existing blown in insulation in inches. Attic existing 3 4 inches of insulation uninsulated floor uninsulated wood frame wall insulated. It now has roughly 3 to 4 inches of blown cellouse insulation. Click the button to calculate the approximate r value for this job.

I live in raleigh north carolina and would like to insulate my 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. 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.

12 inches thick 13 0 20 to 0 40 0 02 30 0 60 to 1 00 0 03. For loose fill cellulose this translates to a total depth ranging from 8 inches. In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. Kraft faced insulation has a vapor retarder that helps to control moisture.

The attic has had no upgrade of insulation since. This calculator is to be used as an estimating tool only. Types of insulation insulation comes in many different forms some of which are listed below. I am leaning towards insulation of pink fiberglass with a r 38 rating.

Use this insulation savings calculator to measure the financial impact of increasing your insulation performance. My house is approximately 1600 sq feet and was built in 1963.