NCC 2025 Volume One F1D3; Volume Two H2D6(1)(a) · AS/NZS 3500.3:2025 (incl. Amd 1:2026) Clause 3.6, Table 3.6.2 and Figure 3.6.2 — or Volume Two H2D6(1)(b) · Housing Provisions 7.4.4(4) and Table 7.4.4c (Class 1 and 10, not VIC)
The calculator runs both NCC 2025 routes: AS/NZS 3500.3 Clause 3.6 (Volume One F1D3 for Class 2 to 9, Volume Two H2D6(1)(a) for Class 1 and 10), or Housing Provisions 7.4.4(4) and Table 7.4.4c for Class 1 and 10 buildings outside Victoria (H2D6(1)(b)); a flatter roof takes a box gutter or a Performance Solution.