Best R Value For Attic

Fibers from rock or recycled slag from blast furnaces.

Best r value for attic.

As a benchmark one inch of solid wood has an r value of 1. There are many ways to retrofit a home with fiberglass and. Better temperature control in your. 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.

The higher the r value the greater the performance of the 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. Add insulation to attic. 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.

Existing 3 4 inches of insulation. 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. See the department of energy s doe ranges for recommended levels of insulation below.

Recommended insulation levels for retrofitting existing wood framed buildings. Your home s age if your home is more than 10 year old you likely need more 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. 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. 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. Just how much you need for your residential or commercial building depends on a number of factors such as your heating system and location. 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. 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.