9.26.2.2.(4)

Intent 1:

To limit the probability of:

• nail head pull-through,
• nail shanks having an inadequate resistance to withdrawal from their substrate, or
• an inadequate resistance to corrosion on exposure to water from rain, or melting snow or ice, or to chemicals (introduced or naturally occurring).

This is to limit the probability of the displacement of roofing materials and components, which could lead to precipitation or meltwater ingress, which could lead to deterioration, which could lead to the structural failure of roofs or assemblies protected by roofs, which could lead to harm to persons.