System Code Climate Zone Purlin Depth Purlin Spacing Roof Pitch Drop Down... SB ‑ 6 ‑ 150 ‑ 4 ‑ 0 6 150 920 or 1220 0 ‑ 4 Degrees Zero ‑ Open... SB ‑ 6 ‑ 150 ‑ 4 ‑ 300 6 150 920 or 1220 0 ‑ 4 Degrees 300mm SB ‑ 6 ‑ 150 ‑ 4 ‑ 600 6 150 920 or 1220 0 ‑ 4 Degrees 600mm
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