The odds are high that conventional contractors will occasionally be called upon to repair or replace an SPF system.
SPF systems are manufactured from a chemically complex mixture of polymeric materials such as liquid isocyanates and liquid polyol resins, which are added to various cell stabilizers, blowing agents, combustion-retarding agents, catalysts and fillers. Polyurethane foam is developed by the heat reaction between the liquid isocyanates and liquid polyol resins coupled with the vaporization of the blowing agent. This reaction forms cells that change the material from a liquid to a cellular mass. The material is spray applied over the existing substrate.