Natural Spaces Skylight Performance Data (glass portion only) |
Glass type & color |
% Daylight
Transmitted |
U-Value
Winter |
R-Value
Center of Glass |
Relative Heat
Gain BTU/hr/sf |
% UV
Blocked |
Clear double pane |
81% |
0.48 |
2.04 |
182 |
36% |
Bronze tint dbl pane |
53% |
0.48 |
2.04 |
135 |
68% |
Grey tint dbl pane |
45% |
0.48 |
2.04 |
131 |
62% |
Solarcool (mirror)grey,dbl #2 |
16% |
0.48 |
2.08 |
85 |
93% |
|
|
|
|
|
|
Clear dbl pane Low-E #3 |
73% |
0.34 |
2.86 |
167 |
50% |
Bronze tint dbl pane Low-E #3 |
44% |
0.34 |
2.86 |
115 |
77% |
Grey tint dbl pane Low-E #3 |
37% |
0.34 |
2.86 |
111 |
73% |
Solarcool (mirror) gry, dbl, Low-E #3 |
14% |
0.34 |
2.94 |
63 |
96% |
|
|
|
|
|
|
Clear dbl pane Low-E #3 Argon |
73% |
0.29 |
3.33 |
167 |
50% |
Bronze tint dbl pane Low-E #3 Argon |
44% |
0.29 |
3.33 |
115 |
77% |
Grey tint dbl pane Low-E #3 Argon |
37% |
0.29 |
3.33 |
111 |
73% |
Solarcool (mirror) gry, dbl, Low-E #3 Argon |
14% |
0.29 |
3.33 |
63 |
96% |
|
|
|
|
|
|
Clear dbl, 2 layers, Low-E, Argon |
|
0.27 |
3.70 |
|
|
|
|
|
|
|
|
Clear triple pane |
65% |
0.29 |
3.45 |
145 |
|
Bronze tint triple pane |
37% |
0.29 |
3.45 |
96 |
|
Grey tint triple pane |
29% |
0.29 |
3.45 |
92 |
|
Solarcool mirror triple pane #2 |
12% |
0.27 |
3.70 |
59 |
|
|
|
|
|
|
|
Clear triple, Low-E #5 Argon |
57% |
0.21 |
4.76 |
99 |
|
Bronze, triple, Low-E #5 Argon |
32% |
0.21 |
4.76 |
67 |
|
Grey, triple, Low-E #5 Argon |
27% |
0.21 |
4.76 |
63 |
|
Clear, triple, 2 Low-E Argon |
|
0.16 |
6.25 |
|
|
|
|
|
|
|
|
Marvin Windows Performance Data (Casement) |
Glass type & color |
% Visable Light
Transmitted |
U-Value
(total unit) |
R-Value
(total unit) |
Solar Heat
Gain Coefficient |
|
Clear dbl, Low-E 2, Argon 3/4" I.G. |
48% |
0.35 |
2.70 |
.30 |
|
Triple, High-R, Low-E 2, Krypton |
38% |
0.27 |
3.70 |
.26 |
|
|
|
|
|
|
|
VELUX Roof Windows and Skylight Performance Data (based on 2010 models using LoE3-366 glass) |
Glass type & color |
% Visable Light
Transmitted |
U-Value
(total unit) |
R-Value
(total unit) |
Solar Heat
Gain Coefficient |
% UV
Blocked |
VSEand VS Units: Clear dbl, Low-E 2, Argon |
|
|
|
|
|
Tempered over tempered glass (05) |
54% |
0.43 |
2.44 |
.23 |
95.2% |
Tempered over laminated glass (04) |
53% |
0.42 |
2.50 |
.23 |
99.9% |
|
|
|
|
|
|
FS Units: Clear dbl, Low-E 2, Argon |
|
|
|
|
|
Tempered over tempered glass (05) |
61% |
0.45 |
2.70 |
.26 |
95.2% |
Tempered over laminated glass (04) |
60% |
0.44 |
2.60 |
.26 |
99.9% |
