Smart moves for a warmer home

Pick from traditional insulation types

There are four traditional types of insulation.

  • Fiberglass: It is inexpensive, easy to install, suitable for DIYers and resistant to moisture and fire. It is the least expensive option.

  • Mineral fiber insulation: Made from slag wool and rock wool, it is similar to fiberglass but costs more. Because of its fire resistance, it is better for use around chimneys.

  • Cellulose: Made from chemically treated recycled paper, it is good for irregular spaces like unfinished attic floors. But it isn’t fire resistant, you can’t install it yourself, rodents can nest in it, moisture will ruin it and the chemicals that are added to it may hurt indoor air quality.

  • Expanded cork: Sustainably harvested from mature oak trees, it is more effective than fiberglass, can reduce sound by up to 50 decibels, can last 50 to 60 years, and is moisture, fire and insect resistant.

Cost varies widely based on the material you choose, how much of it you need and where you live, but we've seen estimates for installed fiberglass insulation of between 50 cents and $1 per square foot. Expect to pay more for the other types of insulation.