Best R Value For 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.

Best r value for attic.

Your home s age if your home is more than 10 year old you likely need more insulation. Where you live different climates require different insulation r values. Therefore it needs to be. Just how much you need for your residential or commercial building depends on a number of factors such as your heating system and location.

Cellulose has an r value of 3 5 inch thickness. 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. The higher the r value the better the thermal performance of the insulation.

Existing 3 4 inches of insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Polyurethane foam has the highest r value 6 5 inch thickness of all the spray in insulation but it is also the most. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Add insulation to 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. There are many ways to retrofit a home with fiberglass and. The higher the r value the greater the performance of the insulation.

Achieving greater r values in exterior walls.