To limit the probability that performance, with respect to the protection of structural wood elements from termite infestation or decay, will fall significantly below expectations.
Where structural wood elements support or are used in assemblies that are required to provide fire resistance, this is to limit the probability of the compromised fire resistance of the assembly, which could lead to harm to persons.
To limit the application of the standard to situations where the limited protection provided by a boron preservative will be adequate.