Attic Insulation R Value Inches

Insulation levels are specified by r value.

Attic insulation r value inches.

Where you live different climates require different insulation r values. The higher the r value the greater the insulation performance. Cellulose insulation has a baseline r value of 3 8 per inch. Add the right kind of insulation.

Input depth of existing blown in insulation in inches. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. As a benchmark one inch of solid wood has an r value of 1. Recommended home insulation r values.

The table below shows what levels of insulation are cost effective for different climates and. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. R value measures how well certain building insulation materials can resist heat.

There are many ways to retrofit a home with fiberglass and. 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. Know exactly how much you need with our project calculators. Click the button to calculate the approximate r value for this job.

The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. This calculator is to be used as an estimating tool only. The higher the r value per inch of thickness the better job the insulation will do when you heat or cool your home. When determining how much insulation you need don t guesstimate calculate.

R value is a measure of insulation s ability to resist heat traveling through it. R value is a measure of insulation s ability to resist heat flow. The r value of insulation is a measure of how well it reduces the flow of heat and cold into and out of your house. Insulation level are specified by r value.

Lighter in weight than cellulose or mineral wool but it settles more than those materials so you ve got to put in a thicker layer to get the protection you need. Your home s age if your home is more than 10 year old you likely need more insulation. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. 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.