A Page 4, Aug. 4 article misstated the position of Britain's Fire Brigades Union. The union supports Greenpeace's criticism of PVC roofing material.
The Aug. 11, Page 7 story ``Group seeks broader PS insulation market'' contained several inaccuracies. All references to steel roofs should read ``steel roof decks,'' and panels should read ``insulation boards.'' The third paragraph should have said that a thermal barrier commonly separates foam plastic insulation from steel roof decks. The test fire cited in the eighth paragraph burned through the entire roof assembly. The SPI Foamed Polystyrene Alliance has argued that large-scale fire test results be used to validate smaller-scale test data. The names of Susan Herrenbruck and Harold Leibovitz were misspelled.