Sentence 9.30.2.4.(1)

Intent 1:

To limit the probability that excessive differential movement of adjoining subfloor panels will be transmitted through the underlay panels, 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.