|
Construction
|
Sheltered
|
Normal
|
Severe
|
|
|
|
|
|
|
Single window glazing
|
5
|
5.6
|
6.7
|
|
Double window glazing with airspace
|
|
|
|
|
25 mm or more
|
2.8
|
2.9
|
3.2
|
|
12 mm
|
2.8
|
3
|
3.3
|
|
6 mm
|
3.2
|
3.4
|
3.8
|
|
3 mm
|
3.6
|
4
|
4.4
|
|
Triple window glazing with airspace
|
|
|
|
|
25 mm or more
|
1.9
|
2
|
2.1
|
|
12 mm
|
2
|
2.1
|
2.2
|
|
6 mm
|
2.3
|
2.5
|
2.6
|
|
3 mm
|
2.8
|
3
|
3.3
|
|
|
|
|
|
|
Roof glazing skylight
|
5.7
|
6.6
|
7.9
|
|
Horizontal laylight with skylight
|
|
|
|
|
or lantern light over ventilated
|
3.5
|
3.8
|
4.2
|
|
unventilated
|
2.8
|
3
|
3.3
|
