An official website of the United States government.

Spray Polyurethane Foam (SPF) Insulation and How to Use it More Safely

Use this information to help ensure the safety of those who apply spray polyurethane foam (SPF) and of the occupants of buildings where SPF is being installed.

SPF is a highly-effective and widely-used insulation and air sealant. However, exposures to SPF's key ingredient, isocyanates and other SPF chemicals in vapors, aerosols, and dust created during and after installation, can cause:

  • Asthma
  • Sensitization
  • Lung damage
  • Other respiratory and breathing problems
  • Skin and eye irritation.

Related EPA activities

Related federal and state activities

Related international activities

Related certification and training