Sentence 9.30.2.2.(1)

Intent 1:

To limit the probability:

• of inadequate rigidity of underlay panels, or
• that the performance of underlay will fall significantly below expectations.

This is to limit the probability that the underlay will be unable to bridge any irregularities in the subfloor and will telegraph them to the finished flooring, which could lead to the displacement or cracking of finished flooring.

Where finished flooring is required to provide water resistance, this is to limit the probability of the ingress of water into the underlay and the subfloor, which could lead to:

• the generation of pollutants from biological growth or from materials that become unstable on wetting, or
• the deterioration of the finished flooring and the subfloor.

This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.