Insulation Safety And Health
When considering a home, health and safety of building materials are a home buyer priority—and insulation is no different. In terms of health and safety properties, not all types of insulation are equal. Below are some key factors to consider when evaluating insulation safety and health implications.
Flame resistance is, naturally, a primary consideration for insulation in the home. As such, one factor in evaluating insulation safety is its resistance to fire.
- Fiberglass and mineral wool insulation
Materials are noncombustible, and remain so for the life of the product. They require no additional fire-retardant chemical treatments—in fact, unfaced fiberglass and mineral wool are accepted as a fire block in wood frames. Note that some fiberglass and mineral wool facings (kraft paper, foil) are combustible, but when properly installed with a code-approved barrier, don’t pose a fire hazard. Kraft facing should never be left exposed.
- Cellulose insulation
Products are largely made of newspaper and other combustible materials. Even though it’s heavily treated with fire-retardant chemicals prior to installation, it is a recognized fire hazard by the Consumer Product Safety Commission (CPSC).1
- Spray Foam insulation
Spray foam insulation will ignite at 700°F.2
Indoor Air Quality
Optimal indoor air quality (IAQ) is key to achieving safe, healthy, relaxing living and working environments. In most cases, comfort is the biggest consideration when evaluating air quality; but with the growing prevalence of asthma and allergies, good IAQ is seen as increasingly critical to health and general well-being.
Ensuring good air quality is no simple task. IAQ can be impacted by many factors in a building, meaning there’s no simple fix if your air quality isn’t what it should be. However, the issue can be broken down into 3 essential approaches.
- Controlling indoor pollutants
- Being mindful of products brought into the home
- Controlling outdoor pollutants
For more details on improving indoor air quality, download Building Science 101.
Not all insulation materials have undergone the same level of testing and scrutiny when it comes to health and safety.
- Fiberglass insulation
Fiberglass insulation is the most thoroughly tested insulation material available. The International Agency for Research on Cancer (IARC), the US National Toxicology Program (NTP) and the California Office of Environmental Health Hazard and Assessment have all stated that fiberglass and mineral wool thermal and acoustic insulations are not considered classifiable as carcinogens.
- Cellulose insulation
Questions about the health and safety aspects of cellulose insulation persist in the building industry because very little medical or scientiﬁc testing of the products has been conducted. There’s still a need for full toxicological testing of dust from cellulose building insulation and dust from pure cellulose ﬁbers.3 Insulation safety conclusions can’t really be drawn until extensive testing is completed.
- Spray foam insulation
The safety of spray foam insulation is still being evaluated. According to the California Department of Toxic Substance Control, one of the main ingredients in spray foam, methylene diphenyl diisocyanate, could pose a number of health risks, including lung damage and asthma.