How Much R Value Do I Need In Attic

R value is an efficiency rating for insulation.

How much r value do i need in attic.

The insulation in your attic should be at least 12 thick. Things needed dust mask. R value is a measure of insulation s ability to resist heat flow. Input depth of existing blown in insulation in inches.

How much insulation do i need in my attic. Recommended home insulation r values. Insulation levels are specified by r value. What r value do i need.

It refers to a particular insulation s ability to resist heat flow. This calculator is to be used as an estimating tool only. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. You ve decided you need to re insulate.

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 the better the thermal performance of the insulation. The thicker the better. There are many ways to retrofit a home with fiberglass and.

Insulation level are specified by 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. That s the first step.

The higher the r value the better the thermal performance of the insulation. 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. 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. 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.

Your next question is most likely how much attic insulation do i need to determine this we need to look at the r value. What r value do i need. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Click the button to calculate the approximate r value for this job.

Your home s age if your home is more than 10 year old you likely need more insulation. How much should i add. 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. It is not uncommon to see 15 to 20 of insulation in a well insulated attic.