🧱
R-Value Layer Calculator
Atsawaphak Sakuldechthana
🧱 Wall
🏠 Roof
🪟 Glass
⚡ Total R-Value
Total R-Value
—
m²·K/W
U-Value
—
W/m²·K
Total Layers:
0
—
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📋 Copy U-Value
📐
Includes Surface Resistance:
Rsi = 0.04 · Rso = 0.13 m²K/W (ASHRAE horizontal heat flow)
⚡ Quick Presets
Layer Stack
(Top = Outside → Bottom = Inside)
Clear All
📐 Cross Section
✓ Selected:
R =
m²K/W
U =
W/m²K
SC =
SHGC =
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