|
Glazing Performance Comparison Chart*
|
|
Glass Type
|
% Visible Daylight Transmission
|
U Value
|
R Value
|
Relative Heat Gain**
|
Shading Coefficient
|
|
Winter
|
Summer
|
Winter
|
Summer
|
|
Clear
|
81
|
0.89
|
0.49
|
1.70
|
2.00
|
183
|
0.88
|
|
Bronze (3/16”)
|
59
|
0.58
|
0.48
|
1.70
|
2.00
|
150
|
0.71
|
|
Low-E
(Pyrolitic)
|
75
|
0.51
|
0.38
|
2.00
|
2.60
|
165
|
0.80
|
|
Bronze lite
|
56
|
0.51
|
0.38
|
2.00
|
2.60
|
134
|
0.64
|
|
SolarCool®
|
25
|
0.59
|
0.49
|
1.70
|
2.00
|
91
|
0.42
|
|
Greylite 14
|
12
|
0.58
|
0.48
|
1.72
|
2.08
|
84
|
0.38
|
|
HeatMirror 44
|
38
|
0.28
|
0.30
|
3.60
|
3.30
|
59
|
0.32
|
|
Bronze HM 44
|
29
|
0.28
|
0.30
|
3.60
|
3.30
|
59
|
0.27
|
|
Low-E Plus
|
72
|
0.24
|
0.22
|
4.17
|
4.54
|
98
|
0.47
|
|
Low-E Plus Sun
|
44
|
0.24
|
0.22
|
4.17
|
4.54
|
79
|
0.38
|
|
16mm opal/clear 3-wall polycarbonate
|
32/70
|
.41
|
|
|
|
|
|
|
25mm opal/clear 5-wall polycarbonate
|
20/55
|
.31
|
|
|
|
|
|
|
*For 7/8” Insulated Glass at 13o Roof Slope **BTU’s
|
