Best R Value For Attic
Polyurethane foam has the highest r value 6 5 inch thickness of all the spray in insulation but it is also the most.
Best r value for attic. Recommended insulation levels for retrofitting existing wood framed buildings. Add insulation to attic. Existing 3 4 inches of insulation. It is manufactured from recycled paper.
The higher the r value the greater the performance of the insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation. See the department of energy s doe ranges for recommended levels of insulation below. There are many ways to retrofit a home with fiberglass and.
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. 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. Your home s age if your home is more than 10 year old you likely need more insulation. Cellulose has an r value of 3 5 inch thickness.
Therefore it needs to be. 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. Achieving greater r values in exterior walls. Mineral wool insulation has a value of 3 1 inch thickness.
The higher the r value the better the thermal performance of the insulation.