板材长度怎么量？

它是沿坡面从檐口到屋脊的距离：建筑半宽乘坡度系数，再加出檐。9 米宽的建筑在 4/12 坡度下每坡约 4.8 米。

金属屋面最小坡度是多少？

远低于瓦材。明钉波形板通常要求 3/12，直立锁边可低至 1/2:12，部分结构性系统可到 1/4:12。请核对具体产品认证。

每方需要多少自攻钉？

明钉板按标准间距每方约 80 颗，含搭接和收边件约每平方英尺 1.5 颗。直立锁边采用隐藏式夹具，这也是其造价更高的重要原因。

可以直接盖在旧瓦上吗？

这种做法很常见且许多地区允许，通常需加木龙骨条形成通风层。请确认结构能承担额外重量，并核对当地规范。

金属屋面下雨时吵吗？

在带防水垫层的实铺基层上，并不比沥青瓦更吵。人们印象中的噪音来自檩条上直接铺板、下面没有基层的谷仓式做法。

金属屋面计算器

计算双坡金属屋面的板材数量、从檐口到屋脊的板长、屋脊盖板以及紧固件用量。

公式与数据最后核对于 2026年8月6日 — Cosyslabs

输入

建筑长度（沿屋脊方向）(ft)

建筑宽度（跨度方向）(ft)

坡度（每 12 的升高）(/12)

板材有效覆盖宽度(in)

板材长度(ft)

损耗百分比

每平方英尺单价（选填）($)

Result

Panels needed

Roof area

1391 ft²

Panel run (eave to ridge): 15.8 ft
Pitch factor: 1.054
Ridge cap: 40.0 linear ft
Approx. screws: 2087

Waste default: 10% — 10% 用于侧向搭接以及斜脊、天沟和穿透部位的裁切。

Diagram

Estimates only. Verify with a licensed contractor or supplier before purchasing. Rough Estimator! is not responsible for shortages, overages, or material variances. See our methodology for formulas and sources.

公式

屋面面积 = 投影面积 × 坡度系数 × (1 + 损耗)

参考资料

Measure what the tool asks for
This calculator works from 建筑长度（沿屋脊方向） in ft, 建筑宽度（跨度方向） in ft and 坡度（每 12 的升高） in /12. Measure the finished area you are covering, not the material — an estimate is only as good as the dimensions you feed it.
What it does with those numbers
屋面面积 = 投影面积 × 坡度系数 × (1 + 损耗) Every figure on the page comes out of that one expression, so you can check it by hand.
Why it adds 10% waste
10% 用于侧向搭接以及斜脊、天沟和穿透部位的裁切。
Where the numbers come from
The constants are taken from Metal Construction Association — Technical resources and installation guidance, IRC R905.10 — Metal roof panels and ASTM E1592 — Structural Performance of Sheet Metal Roof Systems, linked in full below. If a figure here disagrees with your supplier's spec sheet, use the spec sheet — it describes the product you are buying.
What this will not tell you
This is a material takeoff, not a bid. It does not price labour, permits, delivery, equipment hire or site preparation, and it assumes a straightforward layout. Complex cuts, difficult access and awkward shapes all cost more than the geometry suggests.

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屋脊盖板
封堵件
丁基胶带
带 EPDM 垫圈自攻钉
滴水檐
防水垫层

Also useful

Astrilio Property Calculators

常见问题

用檐口长度除以板材有效宽度，再用坡长除以板长。12 米长的双坡屋面配 91 厘米板材，若整长通铺，每坡约 27 块。

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Cite this page

Cosyslabs. (2026). 金属屋面计算器. Rough Estimator!. https://roughestimator.com/zh/metal-roofing-calculator

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