To limit the probability that an inappropriate method of determining roof covering classifications will be used, which could lead to the use of inappropriate roof coverings, which could lead to fire growth and the spread of fire across the roof coverings, which could lead to the spread of fire to occupied parts of the building, which could lead to harm to persons in the building.
To limit the probability that an inappropriate method of determining a roof covering classification will be used, which could lead to the use of an inappropriate roof covering, which could lead to fire growth and the spread of fire across the roof covering, which could lead to the spread of fire to an adjacent building, which could lead to harm to persons in the adjacent building.