Best R Value For Attic

The higher the r value the greater the performance of the insulation.

Best r value for attic.

Better temperature control in your. Our r value cognitive dissonance i m in georgia iecc climate zone 3 where our current state code requires r 13 in exterior walls r 18 in attic kneewalls r 19 in floors and r 30 in ceilings. See the department of energy s doe ranges for recommended levels of insulation below. 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. 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. 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. But newer homes in central and southern arizona are insulated to ratings of r 30 to r 38 while newer homes in northern arizona generally have attic insulation at r 60 because of colder winters.

Cavity wall insulation technique determining what is the best house insulation polyurethane foam has the highest r value 6 5 inch thickness of all the spray in insulation but it is also the most expensive. Add insulation to attic. Where you live different climates require different insulation r values. Just how much you need for your residential or commercial building depends on a number of factors such as your heating system and location.

An insulation r value chart or table can assist you with the calculation to ensure your attic or wall r values are adequate for your. The most common blown in material used but it can rot and grow moldy if exposed to moisture. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. 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.

Fibers from rock or recycled slag from blast furnaces. The r value for loose fill attic insulation is 3 3 inch thickness and is laid between the attic joists. Fibers from recycled post consumer paper that are treated for insect and fire resistance. Existing 3 4 inches of insulation.

Your home s age if your home is more than 10 year old you likely need more insulation. Next to attics and exterior walls crawlspaces and basements have the most potential for heat transfer.