Health & Safety

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.

Note that these factors are for informational purposes only. Please contact the insulation manufacturer for definitive information.

Fire safety

Fire resistance is, naturally, a primary consideration for insulation in a home. As such, one factor evaluating insulation safety is its resistance to fire.

Mineral fiber (fiberglass, rock wool, and slag wool) insulation

Materials are noncombustible, and remain so for the life of the product. They require no additional fire-retardant chemical treatments, and in fact, some unfaced mineral fiber products are accepted as fire stopping and a fire block material.

Cellulose insulation

Products are largely made of newspaper, which is highly combustible. Needs to be heavily treated with fire-retardant chemicals prior to installation.

Spray foam insulation

Spray foam and combustible foamed plastic insulations must be protected by adequate thermal barriers and can not be left exposed to the living environment.

Indoor Air Quality

Optimal indoor air quality (IAQ) is key to achieving safe, healthy, relaxing living environments. In most cases, comfort is the biggest consideration when evaluating air quality, but with 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:

  1. Controlling indoor pollutants, including those caused by moisture
  2. Being mindful of products brought into the home
  3. Controlling outdoor pollutants

For more details on improving indoor air quality, download Building Science 101.

Health Impacts

Not all insulation materials have undergone the same level of testing and scrutiny when it comes to health and safety.

Mineral fiber insulation

The International Agency of Research on Cancer (IARC) has stated that fiberglass and mineral wool thermal and acoustic insulations are not considered classifiable as to carcinogenicity.

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. Safety conclusions can’t really be drawn until extensive testing is completed.

Spray foam

The safety of spray foam insulation is still being evaluated. If you’re worried about the impact of chemicals on your home and family, you’ll want to learn more about the chemical components of spray foam. According to the California Department of Toxic Substance Control, one of the main ingredients in spray foam, methylene diphenyl diisocyanate, could post a number of health risks, including lung damage and asthma.

Different spray foam manufacturers publish different guidelines for length of evacuation times during installation and curing. Note that there are no established evacuation timelines from any government agency.

Mould

Mould can grow in any environment where there’s moisture and food for mould spores, so many organic materials can be food for mould. Even though some products claim to be mould-resistant, it can grow on ANY surface under moist conditions if organic material exists to support the spores. Some considerations when insulating to avoid mould are:

  • Mineral fiber insulation is inorganic, and therefore doesn’t feed mould growth
  • Cellulose and spray foam insulation are composed of organic material, so they can be a food source for mould, unless properly treated with chemicals or other agents that can prevent or inhibit mould growth

Corrosion

Risk of corrosion to pipes, wires, and fasteners is a factor to consider at all phases of home building or improvement, and insulation is no exception. Your insulation choices can affect the possibility of corrosion, including:

  • Fiberglass, rock wool, and slag wool insulation are not corrosive and contains no chemicals that can corrode pipes and wires
  • Cellulose insulation contains certain chemicals routinely applied as a fire retardant to some cellulose insulation. These chemicals, particularly the sulfates, can cause the corrosion of pipes, wires, and fasteners under some conditions[1]

 


[1] K. Sheppard, R. Weil, and A. Desjarlais, “Corrosiveness of Residential Thermal Insulation Materials Under Simulated Service Conditions,” Insulation Materials, Testing and Applications, D.L. McElroy and J.F. Kimpflen, Eds. (ASTM: Philadelphia, PA, 1990), pp. 634-654; “Corrosiveness Testing of Thermal Insulation Materials – A Simulated Field Exposure Study Using a Test Wall, Report ORNL/Sug. 78-7556/4, September 1988