NCC 2025 Volume One F1D3 (Class 2 to 9); Volume Two H2D6(1)(a) (Class 1 and 10) · AS/NZS 3500.3:2025 Clause 3.5, Figure 3.5.5 and Table 3.5.2 — or Volume Two H2D6(1)(b) · Housing Provisions 7.4.3 to 7.4.5 (Class 1 and 10, not VIC)
The calculator runs both NCC 2025 routes: AS/NZS 3500.3 Clause 3.5 (Volume One F1D3 for Class 2 to 9, Volume Two H2D6(1)(a) for Class 1 and 10), or the Housing Provisions Part 7.4 tables for Class 1 and 10 buildings outside Victoria whose roof drains to a system complying with H2D2 (H2D6(1)(b) and (3)).