How Much R Value Do I Need In Attic

Your home s age if your home is more than 10 year old you likely need more insulation.

How much r value do i need in attic.

The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. Insulation level are specified by r value. 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. Recommended home insulation r values.

R value is a measure of insulation s ability to resist heat flow. R value is an efficiency rating for insulation. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. You ve decided you need to re insulate.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. 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. It refers to a particular insulation s ability to resist heat flow. 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.

What r value do i need. This calculator is to be used as an estimating tool only. Insulation levels are specified by r value. Where you live different climates require different insulation r values.

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. It is not uncommon to see 15 to 20 of insulation in a well insulated attic. 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.

That s the first step. R value is a measure of insulation s ability to resist heat traveling through it. How much should i add. There are many ways to retrofit a home with fiberglass and.

What is insulation r value. 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. The higher the r value the better the thermal performance of the insulation. How much insulation do i need in my attic.

Input depth of existing blown in insulation in inches. Things needed dust mask. 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. The higher the r value the better the thermal performance of the insulation.