2×4 墙体的 R 值是多少？

8.9 厘米厚保温棉名义值为 R-13 到 R-15。计入木框架后整墙约降到 R-11，这正是外墙连续保温日益普及的原因。

为什么整墙 R 值低于保温棉标称值？

因为立柱绕过保温层传热。木材每英寸约 R-1.25，而玻璃棉为 R-3.2，且框架占典型墙体面积的 15%–25%。

60 厘米间距能提升保温吗？

能，而且可以量化。它把框架占比从约 15% 降到 10%，即使空腔内保温材料相同，整墙 R 值也会提高。

哪种材料每英寸 R 值最高？

闭孔喷涂泡沫每英寸 R-6 到 R-7，其次是聚异氰脲酸酯 R-6、XPS R-5、岩棉 R-4。玻璃棉和纤维素约在 R-3.2–3.5。

可以把保温棉压缩塞进空腔吗？

压缩会按厚度损失成比例降低 R 值。把 R-19 的棉塞进 8.9 厘米空腔，实际只有约 R-13，等于花了钱却拿不到性能。

保温材料计算器

按材料和空腔深度计算 R 值，并给出扣除框架热桥之后墙体的实际整体 R 值。

公式与数据最后核对于 2026年8月6日 — Cosyslabs

输入

保温面积(ft²)

空腔深度(in)

保温材料类型

框架间距(in)

每平方英尺单价（选填）($)

Result

Nominal R-value

R-11.2

Whole-wall R (with framing)

R-9.1

Area: 800 ft²
R per inch: 3.2
Approx. batts: 80
Framing fraction: 15%

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

名义 R 值 = 每英寸 R 值 × 空腔深度

参考资料

Measure what the tool asks for
This calculator works from 保温面积 in ft², 空腔深度 in in and 框架间距 in in. 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
名义 R 值 = 每英寸 R 值 × 空腔深度 Every figure on the page comes out of that one expression, so you can check it by hand.
Choosing a 保温材料类型
The 保温材料类型 changes the result, so pick the one that matches what you are actually buying rather than leaving the default.
Where the numbers come from
The constants are taken from DOE — Insulation R-values and recommended levels by climate zone and ASHRAE Handbook of Fundamentals — Thermal properties of building materials, 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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隔汽层
气密发泡胶
防水膜胶带
保温固定件

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常见问题

取决于气候区和构造部位。美国能源部建议墙体 R-13 到 R-21，阁楼 R-30 到 R-60，具体按所在分区确定。

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Cite this page

Cosyslabs. (2026). 保温材料计算器. Rough Estimator!. https://roughestimator.com/zh/insulation-calculator

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