Technical details


When choosing a skylight, there are several technical details to consider. Here is a brief explanation of some important specifications:
iDome
Number of skylight dome walls
Clear - opal - Heatstop
Ut-value
LT-value
g-value
Rw-value

iDome - combination of HR++ glass and a plastic skylight

Table with Custom Style
iDome HR++ glass PMMA or PC Material Values
Clear Opal Heatstop U-value LT-value G-value RW-value
In combination with a single-walled skylight Acrylic ⏺ 0.93 W/m²K 68 % 46 % 40 dB
# Acrylic ⏺ 0.93 W/m²K 62 % 40 % 40 dB
# Polycarbonate ⏺ 0.93 W/m²K 66 % 44 % 40 dB
# Polycarbonate ⏺ 0.93 W/m²K 44 % 32 % 40 dB
# Polycarbonate ⏺ 0.93 W/m²K 37 % 31 % 40 dB
iDome HR++ glass PMMA or PC Material Values
Clear Opal Heatstop U-value LT-value G-value RW-value
In combination with a double-walled skylight Acrylic ⏺ 0.79 W/m²K 61 % 40 % 40 dB
# Acrylic ⏺ 0.79 W/m²K 52 % 31 % 40 dB
(A/H) Polycarbonate ⏺ 0.79 W/m²K 59 % 38 % 40 dB
(A/A) Polycarbonate ⏺ 0.79 W/m²K 58 % 37 % 40 dB
(A/O) Polycarbonate ⏺ 0.79 W/m²K 55 % 33 % 40 dB
(A/D) Polycarbonate ⏺ 0.79 W/m²K 38 % 27 % 40 dB
(T/H) Polycarbonate ⏺ 0.79 W/m²K 33 % 27 % 40 dB
(T/O) Polycarbonate ⏺ 0.79 W/m²K 31 % 24 % 40 dB
iDome HR++ glass PMMA or PC Material Values
Clear Opal Heatstop U-value LT-value G-value RW-value
In combination with a triple-walled skylight Acrylic ⏺ 0.69 W/m²K 55 % 34 % 40 dB
# Acrylic ⏺ 0.69 W/m²K 47 % 27 % 40 dB
# Polycarbonate ⏺ 0.69 W/m²K 53 % 33 % 40 dB
# Polycarbonate ⏺ 0.69 W/m²K 46 % 25 % 40 dB
(T/H/H) Polycarbonate ⏺ 0.69 W/m²K 30 % 23 % 40 dB
(T/H/O) Polycarbonate ⏺ 0.69 W/m²K 28 % 21 % 40 dB
iDome HR++ glass PMMA or PC Material Values
Clear Opal Heatstop U-value LT-value G-value RW-value
In combination with a four-walled skylight Acrylic ⏺ 0.61 W/m²K 48 % 29 % 40 dB
# Acrylic ⏺ 0.61 W/m²K 44 % 25 % 40 dB
# Polycarbonate ⏺ 0.61 W/m²K 48 % 28 % 40 dB
# Polycarbonate ⏺ 0.61 W/m²K 44 % 24 % 40 dB
(T/H/H/H) Polycarbonate ⏺ 0.61 W/m²K 26 % 20 % 40 dB
(T/H/O/H) Polycarbonate ⏺ 0.61 W/m²K 24 % 17 % 40 dB
iDome HR++ glass PMMA or PC Material Values
Clear Opal Heatstop U-value LT-value G-value RW-value
In combination with a five-walled Acrylic ⏺ 0.55 W/m²K 44 % 25 % 40 dB
# Acrylic ⏺ 0.55 W/m²K 40 % 22 % 40 dB
# Acrylic ⏺ 0.55 W/m²K 44 % 25 % 40 dB
# Acrylic ⏺ 0.55 W/m²K 40 % 22 % 40 dB
iDome HR++ glass PMMA or PC Material Values
Clear Opal Heatstop U-value LT-value G-value RW-value
In combination with an EP10 skylight Acrylic ⏺ 0.60 W/m²K 38 % 23 % 40 dB
# Polycarbonate ⏺ 0.60 W/m²K 38 % 22 % 40 dB

Peace and quiet thanks to the best sound insulation!


Sound insulation is an essential aspect to consider when choosing a skylight. Especially when you're bothered by tapping sounds from the rain or outside noise in general. The Skylux iDome is the absolute top when it comes to noise reduction.
Skylight type Rw-value (higher = better) Compared to a triple-walled skylight
iDome 40 dB Almost two times quieter than a triple-walled plastic skylight
Skylux iWindow2 39 dB Almost two times quieter than a triple-walled plastic skylight
Skylux iWindow3 41 dB Almost two times quieter than a triple-walled plastic skylight
What does the Rw-value for iDome mean in everyday life?