Sentence 9.20.4.2.(2)

Intent 1:

To limit the probability of discontinuity in mortar joints at vertically aligned webs of hollow masonry units, which could lead to:

• mortar joints of inadequate tensile and compressive strength, or
• the inadequate containment of grout.

Where masonry construction is required to provide fire resistance, this is to limit the probability of compromised fire resistance of the assembly, which could lead to harm to persons.