Calculating Attic Insulation R Value

As a benchmark one inch of solid wood has an r value of 1.
Calculating attic insulation r value. R value measures how well certain building insulation materials can resist heat. R values help homeowners decide which type of insulation material to use and in what thickness. Click the button to calculate the approximate r value for this job. The higher the r value the greater the insulation performance.
When determining how much insulation you need don t guesstimate calculate. The higher the r value the better the thermal performance of the insulation. Applied depth of insulation the height of placing the insulation. An r value is a measure of a given material s.
R value is a measure of insulation s ability to resist heat traveling through it. Input depth of existing blown in insulation in inches. The square footage of the area. To determine the r value of the insulation in your attic you need to know the r value of the type of insulation in your home and the thickness of the insulation.
The length of the area feet inches the width of the area feet inches the coverage of one bag cubic feet the r value per one inch of thickness of the insulation settled the desired r value. Insulation level are specified by r value. Click the button to calculate the depth in inches and pounds of total insulation required for this job. 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. 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. R value of insulation by type. Our calculator helps you measure what r value for exterior walls you may be looking for as well as for different applications.
Input length width and desired r value of the area to be insulated. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Ceiling insulation r value r value for walls and more. R value is a measurement that rates how resistant a product is to heat flow measuring the ability of heat to transfer from one side of an object to another.
This calculator is to be used as an estimating tool only. Inspecting your attic insulation. How to calculate existing r value in an attic. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live.
First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. Here are the r values per inch of the most common types of insulation.