
4
Special installation conditions
VELUX 57
Roof window installed as skylight
• Provide vapour barrier to shaft. Connect
to roof window rebate and existing ceiling
vapour barrier if present.
• Insulate the shaft and depending on the
insulating material establish a wind barrier
on the exterior of the shaft.
• As the windows are installed out of reach,
white finish polyurethane windows GGU
requiring a minimal amount of mainte-
nance are ideal.
When determining position of the light shaft,
consider supported walking areas, ventila-
tion channels, chimneys and antennas/aeri-
als within the roof space/construction.
Ensure all trimming work is carried out to
structural requirements where necessary.
Roof
pitch
Window size Size/cm
X02
78
X04
98
X06
118
X08
140
X10
160
X12
180
15° 0 0 0 0 0 0
20° 0 0 0 0 0 0
25° 0 0 0 0 2 3
30° 0 0 0 2 3 5
35° 0 0 2 3 5 7
40° 0 0 3 5 7 11
45° 0 2 5 7 11 15
50° 0 3 7 11 15 19
55° 2 5 11 15 19 24
60° 3 7 15 19 24 30
65° 5 9 19 24 30 36
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