9.20.7.4.(1)

Intent 1:

To limit the probability of inadequate support of masonry above certain chases or recesses, which could lead to excessive deflection or cracking.

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.

For floors and elements supporting floors, this is to limit the probability of excessive movement, deflection or vibration, which could lead to negative effects on the psychological well-being of persons.