Sentence 9.29.10.4.(1)

Intent 1:

To limit the probability that the tile substrate will have an inadequate resistance to water.

This is to limit the probability of the deterioration of the substrate, which could lead to:

• where the substrate is required to protect foamed plastics, a loss of fire protection, or
• where the substrate is required to contribute to the required fire resistance of assemblies, a loss of fire resistance.

This is to limit the probability of the growth and spread of fire, which could lead to harm to persons.