Preparing for SPF applications

Hazards on roofing jobs take many forms. A momentary lapse in attention, bad judgment or failure to properly set up a job site can result in an injury or, worse, a fatality.

As with all roof system applications, during spray polyurethane foam (SPF) roof system applications, workers should follow proper safety precautions, such as using appropriate fall-protection methods and guarding against burns and electric shocks. However, SPF chemicals present an array of unique safety challenges.


Diisocyanates and polyol resins are two essential chemicals found in SPF. Polyol resins can cause mild irritation to the skin and eyes. When inhaled in high concentrations, these chemicals also can induce labored breathing, light-headedness and headache.

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