VELUX roof windows

GLL 64

VELUX top-operated, centre-pivot roof window

GLL 1064
(interior finish - wood, clear lacquer; exterior cover - aluminum dark gray)

IMPORTANT NOTE: This product is subject to regional limitations, please check availability on the "regions" tab.

The original VELUX top-operated, centre-pivot roof window GLL 1064 delivers energy efficiency without compromising on quality, thanks to an exceptionally affordable triple glazing. The window is easy to operate and gives you the freedom to place furniture underneath.

The window can be installed in roof pitches between 15° and 90° to the horizontal. Note: A combination of roof pitches, window sizes, cover materials and accessories might hinder parking of the sash in some open positions.

Window Code	Width in mm	Height in mm	Effective Daylight Area in m2	Geometric Free Area in m2
CK02	550	778	0.22	0.26
CK04	550	978	0.29	0.34
FK04	660	978	0.38	0.43
FK06	660	1178	0.47	0.54
FK08	660	1398	0.58	0.66
MK04	780	978	0.47	0.53
MK06	780	1178	0.59	0.66
MK08	780	1398	0.72	0.81
MK10	780	1600	0.85	0.94
PK06	942	1178	0.75	0.83
PK08	942	1398	0.92	1.01
SK06	1140	1178	0.95	1.03
SK08	1140	1398	1.16	1.26

Specification

Performance window characteristics	Performance
Thermal transmittance (U-value)	1.0 W/(m²K)

Light transmittance (τ,v)	0.63

Total solar energy transmittance (g-value)	0.45

Sound insulation (Rw)	35(-1;-3)

Air permeability, [class]	4

External fire performance - British [class]	AA

External fire performance - European [class	npd

Impact resistance [class]	3

Load-bearing capacity of safety devices	✓

Reaction to fire [class]	C-s1,d0

Resistance to snow load	See glazing composition

Resistance to wind load [class]	C3 (>SK08: NPD)

Water tightness [class]	E900





Glazing unit	Composition (from inside to outside)
Triple-glazed	6 mm float glass - 13 mm Argon - 3 mm heat strengthened glass - 13 mm Argon - 4 mm toughened glass