Clause 7.4.1.3 of NZS 3604 states that “Where the deck or balcony is to support a cantilever balustrade, boundary edge joists shall be provided”. The SPAX boundary joist solution is used in this situation to attach a double boundary joist to the end of deck joists. The same solution is used to attach the inner end of noggings. 

• Can be used for joist sizes 190 x 45 or 240 x 45
• Specifications available for face-fixed and top-fixed posts
• Applies to timber of grade SG8 or better

The SPAX post fixing solution is used for fixing the cantilever balustrade to the boundary joist.

• Used for both face-fixed and top-fixed posts
• Maximum post spacing provided on the installation instructions

• Must be designed and installed in accordance with the SPAX Boundary Joists Technical Brochure PS1 2020 document

The SPAX Boundary Joist & Post Fixing Solution meets the requirements of:

• Clause B1 of the New Zealand Building Code
• New Zealand standard NZS 3604
• Strength and deflection requirements of AS/NZS 1170