Attic Insulation R Value Inches

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.

Attic insulation r value inches.

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. As a benchmark one inch of solid wood has an r value of 1. R value is a measure of insulation s ability to resist heat traveling through it. When determining how much insulation you need don t guesstimate calculate.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Input depth of existing blown in insulation in inches. Cellulose insulation has a baseline r value of 3 8 per inch. Click the button to calculate the approximate r value for this job.

The higher the r value the greater the insulation performance. 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. The table below shows what levels of insulation are cost effective for different climates and.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. R value is a measure of insulation s ability to resist heat flow. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

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. Your home s age if your home is more than 10 year old you likely need more insulation. Recycled glass or sand that s melted and spun into fibers.

Where you live different climates require different insulation r values. The higher the r value the better the thermal performance of the insulation. Know exactly how much you need with our project calculators. Recommended home insulation r values.

Insulation level are specified by r value. Insulation levels are specified by r value. Add the right kind of insulation. R value measures how well certain building insulation materials can resist heat.