Attic Insulation Rating

If your current insulation is only 5 inches deep you ll need to add seven inches of insulation to achieve the 12 inch r 38 rating.

Attic insulation rating.

Measure the length and width of the area you need to insulate. Typically a higher insulation r rating means better climate control and better energy efficiency for your home. Multiply the length times the width to determine the square footage of the space. 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.

Add insulation to attic. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. Insulation ratings are measured in r values per inch of thickness. Measure the area needing insulation.

You ll need about 12 inches of insulation material. If your insulation doesn t measure up and you need more installation can be done as a weekend diy project or you can call a professional installer to handle the job. Existing 3 4 inches of insulation. An r value tells you how well a type of insulation can keep heat from leaving or entering your home.

Insulation r values vary based on the type thickness and density of the insulation material. Recommended insulation levels for retrofitting existing wood framed buildings.