U-VALUE CALCULATION
External Precast Sandwich Wall Panel — 200mm
Method: ISO 6946 | Code: Dubai Municipality Al Sa'fat 2.0
Panel Composition
Layer
Material
Thickness (mm)
Outer leaf
Precast Concrete
60
Core
EPS Insulation
50
Inner leaf
Precast Concrete
90
TOTAL
200
Thermal Resistance Calculation (R = t/k)
Layer
t (m)
k (W/m.K)
R = t/k (m2.K/W)
Rsi — Inside surface
—
—
0.130
ISO 6946 (fixed)
Inner Concrete (90mm)
0.090
1.75
0.051
ACI / standard
EPS Insulation (50mm)
0.050
0.032
1.563
Manufacturer data
Outer Concrete (60mm)
0.060
1.75
0.034
ACI / standard
Rse — Outside surface
—
—
0.040
ISO 6946 (fixed)
R TOTAL
Note
1.818 m2.K/W
Result
U = 1 / R total = 1 / 1.818
U = 0.55 W/m2.K
Allowable (Al Sa'fat 2.0 — External Walls)
U max = 0.57 W/m2.K
STATUS
0.55 < 0.57 — PASS ✓
Reference: ISO 6946 | Dubai Municipality Al Sa'fat Green Building Rating System v2.0 (2024)