Attic Insulation R Value Inches

The higher the r value the greater the insulation performance.

Attic insulation r value inches.

Your home s age if your home is more than 10 year old you likely need more insulation. Add the right kind of insulation. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. Recycled glass or sand that s melted and spun into fibers.

Click the button to calculate the approximate r value for this job. Insulation levels are specified by r value. 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. There are many ways to retrofit a home with fiberglass and.

As a benchmark one inch of solid wood has an r value of 1. When determining how much insulation you need don t guesstimate calculate. 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.

The table below shows what levels of insulation are cost effective for different climates and. 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. Insulation level are specified by r value. The higher the r value per inch of thickness the better job the insulation will do when you heat or cool your home.

The higher the r value the better the thermal performance of the insulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Where you live different climates require different insulation r values. Know exactly how much you need with our project calculators.

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 traveling through it. The higher the r value the better the thermal performance of the insulation. Cellulose insulation has a baseline r value of 3 8 per inch.

Recommended home insulation r values. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. 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. The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches.