Best R Value For Attic

Fibers from rock or recycled slag from blast furnaces.

Best r value for 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. Better temperature control in your. As a benchmark one inch of solid wood has an r value of 1. Next to attics and exterior walls crawlspaces and basements have the most potential for heat transfer.

See the department of energy s doe ranges for recommended levels of insulation below. 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. Recommended insulation levels for retrofitting existing wood framed buildings. Fibers from recycled post consumer paper that are treated for insect and fire resistance.

Just how much you need for your residential or commercial building depends on a number of factors such as your heating system and location. The higher the r value the greater the performance of the insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Where you live different climates require different insulation r values.

The r value for loose fill attic insulation is 3 3 inch thickness and is laid between the attic joists. 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. Your home s age if your home is more than 10 year old you likely need more insulation. Existing 3 4 inches of insulation.

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. There are many ways to retrofit a home with fiberglass and. The most common blown in material used but it can rot and grow moldy if exposed to moisture. 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.

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 addition to attics and exterior walls you can get greater r values for your home by remembering to insulate these areas as well.