When making stairs and choosing the correct size stringers, use the joist table in Nzs 3604 to select the correct span for the length of the stairs. This will also apply to the treads in handling the load of standing on them.
CONSTRUCTION OF A DECK OVER 1M HIGH WITH ACCESS STAIRS
• B1 Structure: B1/AS1 construction and framing generally complies with NZS 3604 or where the
deck is over 3m high, specifically engineer designed using NZS 4203.
• B1 Structure: B1/AS2 for timber barriers. Other barriers require specific engineering design to
NZS 4203.
• B2 Durability: B2/AS1 with timber members are treated in accordance with NZS 3602 and
fixings to NZS 3604.
• D1 Access routes: D1/AS1 for stair dimensions, slip resistance and handrails.
• E2 External moisture: E2/AS1 particularly detailing the junction between deck and house.
• F4 Safety from falling: F4/AS1 as an area frequented by children under 4 years.
