以下详细说明暂以英文提供。
How boards are counted
Deck boards run one direction — usually along the long side and parallel to the house — so the number you need comes from the width: divide it by the board width plus its drainage gap, and round up to a whole board. The classic pressure-treated "six-inch" board actually measures 5½ inches, and gaps of ¼ inch are typical for wood (composites often want the manufacturer's own figure), which is why a nominal 12-foot width takes 26 boards rather than 24.
Screws and what the price covers
The screw estimate runs about 350 fasteners per 100 square feet, matching two screws per joist crossing on 16-inch centers. Board cost multiplies your per-board price by the count, assuming each board is cut from a length matching the deck — boards are sold in fixed lengths like 8, 12, and 16 feet, so real shopping lists jump to the next available length and generate offcuts. The frame beneath, hardware, and railing are separate line items entirely.
中国本地参考
日常计算时值得知道的中国本地规则：
- 计量的单位习惯: 住房面积用平方米，土地常用亩（1 亩 ≈ 666.7 平方米）；里程用公里，油耗用 L/100km。
- 日期与数字格式: 日期写作 2026年10月13日（年-月-日）；大数习惯用万、亿（1 万 = 10,000，1 亿 = 100,000,000）。
- 法定节假日: 全年法定节假日 11 天，春节与国庆为长假；调休安排每年由国务院办公厅发布。
- 速度与限速: 高速公路最高限速 120 km/h，城市快速路多为 80 km/h，均以公里每小时计。
- 鞋服尺码: 鞋码用中国码（毫米制），服装常用 155/80A 这类身高围度组合，与欧美码不同。
数据核对：2026 年 10 月
常见问题
What board size is standard?
Five and a half inches wide is the face of a nominal 1×6 or 5/4×6 board, the most common decking in North America. Composites and PVC come in similar widths, but check the label — a tenth of an inch per board shifts the count on wide decks.
Why leave gaps between boards?
Gaps let rain drain and boards shed swelling without buckling. Wood shrinks after installation so tight-laid pressure treated often gaps itself, but composites never shrink — their spacing is permanent from day one.
Does the estimate include the frame and railing?
No. Joists, beams, posts, hardware, railing, and stairs typically add 50–100% to the decking bill, and labor on a pro build usually rivals the material total.