Attic Insulation R Value Inches

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.

Attic insulation r value inches.

Recommended home insulation r values. 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. The higher the r value per inch of thickness the better job the insulation will do when you heat or cool your home.

There are many ways to retrofit a home with fiberglass and. Insulation level are specified by r value. Where you live different climates require different insulation r values. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

R value is a measure of insulation s ability to resist heat flow. When determining how much insulation you need don t guesstimate calculate. Recycled glass or sand that s melted and spun into fibers. This calculator is to be used as an estimating tool only.

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. Click the button to calculate the approximate r value for this job. R value is a measure of insulation s ability to resist heat traveling through it. Know exactly how much you need with our project calculators.

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. The higher the r value the greater the insulation performance. R value measures how well certain building insulation materials can resist heat. Add the right kind of insulation.

As a benchmark one inch of solid wood has an r value of 1. The higher the r value the better the thermal performance of the insulation. 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. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

The higher the r value the better the thermal performance of the insulation. Insulation levels are specified by r value. The table below shows what levels of insulation are cost effective for different climates and. Input depth of existing blown in insulation in inches.