When retrofit work is about to begin, it will be necessary to determine the readiness of insulated assemblies for spray foam. It is most desirable that surfaces be clean and dry to accept spray foam. Wood should have a moisture content of less than 19%. Concrete should be visibly dry and free of residue. Metals should be free of dirt and oil. Any surfaces subjected to flooding should be disinfected and treated to address mold. Residual salt should not impact spray foam.