PDFWAC 51-11C-30315

Table C303.1.5—U-factors for spandrel panels and glass curtain walls.

Table C303.1.5
U-Factors for Spandrel Panels and Glass Curtain Walls
 
 
Rated R-Value of Insulation Between Framing Members
None
R-4
R-7
R-10
R-15
R-20
R-25
R-30
Frame Type
Spandrel Panel
 
A
B
C
D
E
F
G
H
Aluminum without Thermal Break
Single glass pane, stone or metal panel
1
0.360
0.242
0.222
0.212
0.203
0.198
0.195
0.193
Double glass with no low-e coatings
2
0.297
0.233
0.218
0.209
0.202
0.197
0.194
0.192
Triple or low-e glass
3
0.267
0.226
0.214
0.207
0.200
0.196
0.194
0.192
Aluminum with Thermal Break
Single glass pane, stone or metal panel
4
0.350
0.211
0.186
0.173
0.162
0.155
0.151
0.149
Double glass with no low-e coatings
5
0.278
0.200
0.180
0.170
0.160
0.154
0.151
0.148
Triple or low-e glass
6
0.241
0.191
0.176
0.167
0.159
0.153
0.150
0.148
Structural Glazing
Single glass pane, stone or metal panel
7
0.354
0.195
0.163
0.147
0.132
0.123
0.118
0.114
Double glass with no low-e coatings
8
0.274
0.180
0.156
0.142
0.129
0.122
0.117
0.114
Triple or low-e glass
9
0.231
0.169
0.150
0.138
0.127
0.121
0.116
0.113
No Framing, or Insulation is Continuous
Single glass pane, stone or metal panel
10
0.360
0.148
0.102
0.078
0.056
0.044
0.036
0.031
Double glass with no low-e coatings
11
0.297
0.136
0.097
0.075
0.054
0.043
0.035
0.030
Triple or low-e glass
12
0.267
0.129
0.093
0.073
0.053
0.042
0.035
0.030
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-30315, filed 11/26/19, effective 7/1/20.]