9.26.9.4.(1)

Intent 1:

To limit the probability of:

• jamming and buckling, cracking or dislodgement of wood shingles, or
• aligned joints in succeeding courses.

This is to limit the probability of water penetrating directly to roof decking or sheathing, 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.