9.20.3.2.(4)

Objective

OS1 Fire Safety

Attribution

[F20,F21-OS1.2]Applies to assemblies required to provide fire resistance.

Intent

Intent 1:

To limit the probability of:

  • an excessively high cement/aggregate ratio, which could lead to poor workability, excessive compressive strength and attendant high shrinkage, which could lead to cracking of grout, or
  • an excessively low cement/aggregate ratio, which could lead to weak, porous grout and inadequate bonding with masonry units and reinforcing steel.

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

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