Best R Value For Attic

You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Best r value for attic.

The higher the r value the greater the performance of the insulation. Recommended insulation levels for retrofitting existing wood framed buildings. 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. 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.

In addition to attics and exterior walls you can get greater r values for your home by remembering to insulate these areas as well. Add insulation to attic. See the department of energy s doe ranges for recommended levels of insulation below. Next to attics and exterior walls crawlspaces and basements have the most potential for heat transfer.

Fibers from recycled post consumer paper that are treated for insect and fire resistance. The r value for loose fill attic insulation is 3 3 inch thickness and is laid between the attic joists. Where you live different climates require different insulation r values. 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. As a benchmark one inch of solid wood has an r value of 1. Existing 3 4 inches of insulation. 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. 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. Better temperature control in your. Just how much you need for your residential or commercial building depends on a number of factors such as your heating system and location.

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. The most common blown in material used but it can rot and grow moldy if exposed to moisture.