Sentence 9.20.4.1.(2)

Intent 1:

To limit the probability of excessive deviation from the optimum mortar-joint thickness required to ensure continuous support of masonry units while maintaining adequate mortar-to-masonry-unit bond strength and adequate compressive strength of assemblies.

This is to limit the probability of:

• compromised structural integrity of masonry construction,
• where masonry construction is part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to deterioration,
• in assemblies exposed to moisture or the exterior, damage and deterioration, or
• an inability to resist expected loads, which could lead to excessive deflection or vibration of floors.

For floors and elements supporting floors, this is to limit the probability of persons losing their balance, tripping or falling, which could lead to harm to persons.