Under NZS 3604:2011 Timber-framed buildings, the maximum loading for a timber-framed deck is 2 kPa. To select the appropriate subfloor framing, use:
• Table 6.4 (b) for bearers that are wet in service
• Table 7.1 (b) for joists that are wet in service.
Where the deck loading is above 2 kPa, the deck must use specific engineering design. While there are 3 kPa floor load tables for joists and bearers in NZS 3604:2011, these only apply to timber that is dry in service.
Summarised from BRANZ Guideline, April 2015