These insulations contain a chemical additive to inhibit accidental ignition from a small fire source. This additive will not prevent burning when the insulation is exposed to a large continuous fire source. Observe normal fire safety precautions and good housekeeping practices on construction sites. Avoid open flame, welding torches, high intensity lamps, etc. If welding is to be done around plastic foam, protect it with asbestos or gypsum board.
Fire extinguishers using water, foam, carbon dioxide or dry chemical are all effective.
Do not leave plastic foam insulation exposed in inhabited areas. Caution PlastiSpan EPS foam will soften and collapse in the presence of petroleum solvents. Use emulsion adhesives and coatings or check the manufacturer's recommendations to be sure that the adhesive or coating is suitable for use with expanded polystyrene foam. Where PlastiSpan insulation is used in built-up roofing, special care is needed to prevent hot asphalt from deteriorating the insulation. It will shrink and warp with continuous exposure to higher temperatures.