Attic Insulation Rating

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. Typically a higher insulation r rating means better climate control and better energy efficiency for your home. Measure the area needing insulation.

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Multiply the length times the width to determine the square footage of the space.

Attic insulation rating.

Add insulation to attic. Insulation r values vary based on the type thickness and density of the insulation material. Insulation ratings are measured in r values per inch of thickness. You ll need about 12 inches of insulation material.

Let s say the insulation you ve selected has an r value of three per inch and you d like to achieve an overall value of r 36. 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. 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. See the department of energy s doe ranges for recommended levels of insulation below.

Measure the length and width of the area you need to insulate. 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. An r value tells you how well a type of insulation can keep heat from leaving or entering your home. Existing 3 4 inches of insulation.

Recommended insulation levels for retrofitting existing wood framed buildings. 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.

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