Best R Value For Attic

Existing 3 4 inches of insulation.

Best r value for attic.

The higher the r value the better the thermal performance of the insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation. There are many ways to retrofit a home with fiberglass and. The higher the r value the greater the performance of the insulation.

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. 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.

Add insulation to attic. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Mineral wool insulation has a value of 3 1 inch thickness. Achieving greater r values in exterior walls.

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. Polyurethane foam has the highest r value 6 5 inch thickness of all the spray in insulation but it is also the most. Recommended insulation levels for retrofitting existing wood framed buildings. 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.

See the department of energy s doe ranges for recommended levels of insulation below.