A commercial building is being constructed with a steel deck roof assembly. The specifier requires a minimum fire resistance rating of 1 hour. Which type of fire-resistant material should be used between the steel deck and the roof insulation to meet this requirement?
- Type X gypsum board
- BType C gypsum board
- CType I gypsum board
- DType II gypsum board
Exam tip
Remember the different fire resistance ratings for various types of gypsum board and their applications.
Why A is correct
Type X gypsum board is required for a 1-hour fire resistance rating in steel deck roof assemblies. Type C is for 1/2-hour, Type I for 1-hour, and Type II for 2-hour ratings, which do not meet the specifier's requirement.