The ceiling wall of the library should be decorated with no less than b 1.
B 1 Decoration materials have good fire resistance. Ceiling materials include gypsum board and fiber gypsum board, and wall materials include flame retardant plywood and colorful coatings. These materials can reduce the toxic smoke produced in fire and provide more safe time for evacuation. In public places like libraries, the use of B 1 decoration materials helps to ensure the life safety of readers and staff.