3M announced that its Fire Barrier Water Tight Silicone Sealants are the first firestopping systems that meet the new Underwriters Laboratories (UL) W Rating-Class One requirements for water tightness when used on horizontal floor penetrations. These firestopping systems help reduce the chance of water damage and help protect builders, owners and occupants from potential problems associated with water and moisture intrusion, making them ideal for use in fast-track construction.