To limit the probability that inappropriate material will be used for roof deck supports, which could lead to their involvement in fire growth and spread, which could lead to the weakening and collapse of the supports, which could lead to the collapse of the roof deck assembly, which could lead to harm to persons, including emergency responders.
To limit the probability that inappropriate material will be used for roof deck supports, which could lead to their involvement in fire growth and spread, which could lead to the spread of fire to occupied parts of the building, which could lead to harm to persons.