Attic Insulation R Value Inches

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Attic insulation r value inches.

Recommended home insulation r values. 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. Insulation levels are specified by r value. There are many ways to retrofit a home with fiberglass and.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. 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. 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.

The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. The higher the r value the greater the insulation performance. The table below shows what levels of insulation are cost effective for different climates and. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

As a benchmark one inch of solid wood has an r value of 1. Insulation level are specified by r value. The higher the r value the better the thermal performance of the insulation. R value is a measure of insulation s ability to resist heat flow.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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. Input depth of existing blown in insulation in inches. R value measures how well certain building insulation materials can resist heat.

Where you live different climates require different insulation r values. Add the right kind of insulation. 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. When determining how much insulation you need don t guesstimate calculate.

Cellulose insulation has a baseline r value of 3 8 per inch. The higher the r value per inch of thickness the better job the insulation will do when you heat or cool your home. Recycled glass or sand that s melted and spun into fibers. Click the button to calculate the approximate r value for this job.