B1/AS1: Structural provisions for buildings

B1 STRUCTURE ACCEPTABLE SOLUTION B1/AS1 Buildings and structures 2.4 Earth buildings 2.4.1 Earth walled buildings 2.4.1.1 Earth buildings shall comply with NZS 4299 subject to the modifications in Subsections 2.4.1, 2.4.2, and 2.4.3. 2.4.2 Definitions 2.4.2.1 In NZS 4299 Clause1.3 Definitions, add in the definition for Good Ground: “liquefaction, lateral spread,” after “subsidence” in subclause (c). 2.4.3 Earthquake zones 2.4.3.1 In NZS 4299 Clause 2.3 Earthquake zones, add to the end of Clause 2.3: “The earthquake zone factor > 0.6 shall apply to the Canterbury earthquake region.” 2.4.3.2 In NZS 4299 Figure 2.1 Earthquake zones, on the map shown, the Canterbury earthquake region shall be interpreted as having an earthquake zone factor of > 0.6. 2.4.4 Concrete slab-on-ground floors 2.4.4.1 In NZS 4299, replace Clause 4.8.6 with: “Clause 4.8.6 The thickness and reinforcement and detail of concrete slabs shall comply with the requirements of NZS 3604 as modified in Acceptable Solution B1/AS1 Section 2.3.” MINISTRY OF BUSINESS, INNOVATION AND EMPLOYMENT 28 JULY 2025 Page 15