What is the difference between Grace & Water Shield and Grace Ultra?
The main difference is in the type of adhesives. Grace Ice & Water Shield uses an adhesive based on SBS rubber, whereas Grace Ultra uses one based on butyl rubber. Simply stated, butyl rubber offers exceptional stability at high temperatures. In some roofing applications, such as those in the desert southwest, rooftops can get so hot that SBS-based adhesives can start to melt. Butyl rubber-based membranes remain stable for long periods of time even at extreme rooftop temperatures. This means that Grace Ultra may be left exposed to the sun for up to 60 days.
