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Reference — AS 1684.2 Figure 6.20
Table 19 — Sheet roof (max total mass 40 kg/m²).
Table 20 — Tile roof (max total mass 90 kg/m²).
For lintels supporting distributed (uniformly applied) roof loads, use Tables 17 & 18.
For lintels supporting hanging beams, take the area supported as half the ceiling area supported by the lintel.
Minimum bearing length = 35 mm unless a bearing subscript is shown (e.g. (+5 mm brg) means min bearing = 35 + 5 = 40 mm).