Civil Engineering Reference
In-Depth Information
Table 11 Empirically constant [
9
]
R-Value, position, and width (or depth) of insulation
F2
Btu/h ft
°
F W/m K
Uninsulated slab
0.73
1.26
R-5 (SI:R-0.88) horizontal insulation, 2 ft (0.6 m), no thermal break
0.70
1.21
R-10 (SI:R-1.76) horizontal insulation, 2 ft (0.6 m), no thermal break
0.70
1.21
R-15 (SI:R-2.64) horizontal insulation, 2 ft (0.6 m), no thermal break
0.69
1.19
R-5 (SI:R-0.88) horizontal insulation, 4 ft (1.2 m), no thermal break
0.67
1.16
R-10 (SI:R-1.76) horizontal insulation, 4 ft (1.2 m), no thermal break
0.64
1.11
R-15 (SI:R-2.64) horizontal insulation, 4 ft (1.2 m), no thermal break
0.63
1.09
R-5 (SI:R-0.88) vertical insulation, 2 ft (0.6 m)
0.58
1.00
R-10 (SI:R-1.76) vertical insulation, 2 ft (0.6 m)
0.54
0.93
R-15 (SI:R-2.64) vertical insulation, 2 ft (0.6 m)
0.52
0.90
R-5 (SI:R-0.88) vertical insulation, 4 ft (1.2 m)
0.54
0.93
R-10 (SI:R-1.76) vertical insulation, 4 ft (1.2 m)
0.48
0.83
R-15 (SI:R-2.65) vertical insulation, 4 ft (1.2 m)
0.45
0.78
R-10 (SI:R-1.76) fully insulated slab
0.36
0.62
Table 12 Empirically constant perimeter [
9
]
Construction
Btu/h
°
F ft perimeter
degree days (65
°
F
base)
Insulation
W/K m perimeter
degree days (18
°
C
base)
2,950
5,350
7,433
1,640
2,970
4,130
(a) Block wall,
8 in. (200 mm),
brick facing
Uninsulated
0.62
0.68
0.72
1.07
1.17
1.24
Insulated from
edge to footer: (SI:
R-0.95 m
2
K/W)
0.48
0.50
0.56
0.83
0.86
0.97
(b) Block wall,
4 in. (100 mm),
brick facing
Uninsulated
0.80
0.84
0.93
1.38
1.45
1.61
Insulated from
edge to footer: (SI:
R-0.95 m
2
K/W)
0.47
0.49
0.54
0.81
0.85
0.93
(c) Metal stud
wall, stucco
Uninsulated
1.15
1.20
1.34
1.99
2.07
2.32
Insulated from
edge to footer (SI:
R-0.95 m
2
K/W)
0.51
0.53
0.58
0.88
0.92
1.00
(d) Poured
concrete wall with
duct near perimeter
Uninsulated
1.84
2.12
2.73
3.18
3.67
4.72
Insulated from
edge to footer: (SI:
R-0.95 m
2
K/W)
0.64
0.72
0.90
1.11
1.24
1.56
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