How We Rate Insulation Technologies

► Ratings are based on averages and estimates for a 2 x 6 R-19 wall.

Environmental Impact

Our Environmental Impact Rating for insulation is based on each insulating material Consumption Rating (see below) and material environmental impact score (which takes into account the embodied energy used to make the insulating material; the potential toxicity of the material; if the material contains recycled content and/or if it is derived from a rapidly renewable resource; and if the material can be recycled or effectively reused at the end of its useful life).

The higher the Environmental Impact Rating, the less-toxic and energy-intensive the material is to manufacture and dispose of; the less natural resources it requires to exist; and the more recyclable it is at the end of its life.

Consumption

Our Consumption Rating for insulation is based on the material's average thermal resistance (R-value per inch of thickness). R-value measures a material's thermal resistance; the higher the R-value, the better the material is at keeping hot air inside during the winter and cold air inside during the summer.

The higher the Consumption Rating, the more efficient the material and the higher its R-value.

Toxicity

Our Toxicity Rating for insulation is based on whether the insulating material/technology contains toxins such as formaldehyde, which are hazardous to humans, and/or CFCs, which are harmful to the natural environment.

The higher the Toxicity Rating, the less-toxic the insulating material.

Price

Our Price Rating for insulation is based on each material’s average price per square foot at R-19, plus the cost of installation.

The higher the Price Rating, the better (lower) the price of the product.