The design Standard for design and construction of support framing (piles and jack studs) to decks is Section 6 of NZS 3604. Timber piles/jack studs supporting a deck must be either 125 mm square or 140 mm diameter round, treated to H5.
The pile/jack stud size requirement applies regardless of the height of the deck off the ground.
Related Touchstone article
- Revised timber-framed buildings Standard NZS 3604 – public comment completed – this issue, June 2010.
Reproduced from BRANZ Guideline May 2010.