City of Calgary Uncovered Deck Worksheet
Deck Post Spacing 计算器
根据 2026 年 2 月 Calgary worksheet 第 3 页：先检查 joist span，再用 Supported Joist Length 查 beam / post spacing 表。
PDF formula / 查表公式
Supported Joist Length = Joist Span / 2 + Joist Cantilever
Beam 表格行按计算结果向上取整到 8, 10, 12, 14, 16, 18, 20 ft。
1输入 / Inputs
Deck size / Deck 尺寸
从 house wall 到 deck 外边，单位 ft；包含 joist cantilever。
沿 beam 和 post 排列方向，单位 ft。
Joists / 搁栅
PDF joist span table 使用 12, 16, 24 in O.C.。
PDF 第 3 页只列出 2x8, 2x10, 2x12。
PDF plan view 标注 max 2'-0"，单位 ft。
Beam/post spacing 表按 Supported Joist Length 查。
Posts / posts 与水泥墩
PDF plan view 标注 max 2'-0"。填 0 会更保守。
Joist span table 的 decking thickness 条件。
2结果 / Results
Joist
Beam
Post
Worksheet status / PDF 表格状态
Ready
PDF table checks will appear here.
Estimated joist count / joist 数量
13
Includes both rim joists.
Joist span / joist 实际跨距
10.00 ft
Compared against the PDF joist table.
Supported Joist Length / 查 beam 表长度
7.00 ft
Rounded up to the next PDF table row.
Selected beam row / 当前 beam 查表
3-ply 2x10
Maximum post spacing from the PDF table.
Max post spacing / 最大 post 中心间距
9'-11"
Distance between posts, not deck width.
Suggested posts / 建议 post 或水泥墩
3
Based on beam cantilever and deck width.
3Beam 表格对比 / Beam Table Comparison
| Beam size / 梁组合 | Max post spacing / 最大 post 间距 | Suggested layout / 当前尺寸排布 | Status / 状态 |
|---|
Source / 数据来源：City of Calgary, Uncovered Deck Worksheet, last update Feb. 2026, page 3. Tables assume SPF No.1 and No.2 grade lumber. This calculator does not cover roofs, hot tubs, unusual loads, non-rectangular decks, screw pile engineering, guards, stairs, or permit interpretation.