How Much R Value Do I Need In Attic

Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Input depth of existing blown in insulation in inches. R value is a measure of insulation s ability to resist heat flow.

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Recommended home insulation r values.

How much r value do i need in attic.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. You ve decided you need to re insulate. What is insulation r value. It is not uncommon to see 15 to 20 of insulation in a well insulated attic.

How much should i add. How much insulation do i need in my attic. 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.

For example if your home has cellulose insulation at a depth of 8 inches between the joists the attic insulation has an r value of 3 7 times 8 or 29 6. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. If your attic insulation is only a few inches thick or if you can see the ceiling joists you re wasting money on your heating and cooling bills. R value is a measure of insulation s ability to resist heat traveling through it.

Insulation levels are specified by r value. Where you live different climates require different insulation r values. It refers to a particular insulation s ability to resist heat flow. The higher the r value the better the thermal performance of the insulation.

What r value do i need. Things needed dust mask. 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 an efficiency rating for insulation.

That s the first step. What r value do i need. Insulation level are specified by r value. Your next question is most likely how much attic insulation do i need to determine this we need to look at the r value.

The thicker the better. Click the button to calculate the approximate r value for this job. 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 in your attic to reach r 30 if you live in zones 2 or 3.

This calculator is to be used as an estimating tool only. The insulation in your attic should be at least 12 thick. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

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