In New Zealand, deck balustrades must comply with the New Zealand Building Code to ensure safety and structural integrity. Some of the key requirements for deck balustrades as per the NZ Building Code and its associated standards are:
Height: The minimum height for deck balustrades is 1000mm (1 meter) for decks that are more than 1 meter above the ground. For decks with a fall height between 1 meter and 2 meters, a barrier with a minimum height of 900mm is required on stairways.
Gap Size: The gaps between balusters or openings in the barrier should not be more than 100mm. This is to prevent small children from falling through or getting stuck between the balusters.
Strength: Balustrades must be strong enough to withstand the forces they might be subjected to, such as people leaning against them. The structural strength depends on the materials used, the design, and the construction method. NZS 3604:2011 provides guidance on the required strength and loading requirements for barriers.
Climbability: Balustrades should not have any horizontal or near-horizontal elements between 150mm and 760mm above the floor that could facilitate climbing by children.
Materials: Balustrades should be constructed using durable materials that can withstand exposure to weather and other environmental conditions, as well as resist decay, corrosion, and damage.
Attachment: Balustrades should be securely attached to the deck structure, ensuring stability and safety.
Compliance: The construction of deck balustrades must comply with the relevant New Zealand standards, such as NZS 3604:2011 Timber-framed buildings and NZS 4223.3:2016 Glazing in Buildings - Human Impact Safety Requirements.