Finished Attic Insulation R Value

Add insulation to attic.

Finished attic insulation r value.

I used the r value calculated and it recommended an r value of 49. If you are planning on a diy attic remodel you can expect to pay approximately 5 000 for materials including drywall insulation and carpeting depending on the size of the attic. Where you live different climates require different insulation r values. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. To find the r value of the existing insulation in your attic multiply the number of inches of insulation by the r value for your particular type. Is this too much for a finished attic. The higher the r value the greater the insulation performance.

When determining how much insulation you need don t guesstimate calculate. Adding multiple layers of insulation doesn t increase the r value because it is measured in conducted heat ventilation is very important when you insulate your. Warmer climates only require an r 38 or higher or about 12 or more. There are many ways to retrofit a home with fiberglass and.

This means less cold air in the winter and more in the summer. 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. Recommended insulation levels for retrofitting existing wood framed buildings. None of them have any insulation and it was recommended that it be added by our home inspector.

For example if your home has cellulose insulation at a depth of 8 inches between the joists the attic insulation has an r value of 3 7 times 8 or 29 6. Finishing an attic with trusses if your roof is supported by trusses you will probably not have the space in your attic to build a room. Know exactly how much you need with our project calculators. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

As a benchmark one inch of solid wood has an r value of 1. Your home s age if your home is more than 10 year old you likely need more insulation.