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A roof lantern above a bedroom works well, provided you sort out three things: blackout, sound insulation and protection against summer heat.
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A roof lantern above a bedroom works well, provided you sort out three things: blackout, sound insulation and protection against summer heat. Triple glazing is often the best choice here, as it insulates better and dampens rain a little more. A blackout pleated blind or screen makes sure the sun does not wake you at five in June.
A roof lantern above a bedroom or guest room gives you a bright, fresh space during the day. Particularly with a roof extension or a bedroom in a single storey extension, it is sometimes the only way to get good daylight in. But a bedroom has different needs from a living room. At night you want it dark, quiet and cool.
So the points to watch are light, sound and temperature, plus a little ventilation. All four are easy to solve, as long as you take them into account when ordering.
In late June it gets light in the Netherlands before half past five. A roof lantern lets that light straight in. A blackout pleated blind on the inside closes off the glass and can be operated per pane. A screen on the outside also keeps heat out. Frosted glass diffuses the light but does not make it dark, so on its own it is no solution for a bedroom.
Triple glazing has a U-value of about 0.5 W/m²K, compared with about 1.1 for HR++ double glazing. The inner pane stays warmer in winter, so you feel less cold downdraught and see condensation less quickly. In a bedroom, where the heating is often lower and a window may be ajar, that is especially valuable. DagLichtDesign therefore recommends triple glazing mainly above bedrooms. The quote lists HR++ and triple side by side.
Triple glazing reduces outside noise by around 36 dB, against around 32 dB for HR++. How that works out with rain is explained under rain noise on a roof lantern. The full comparison of glass types is in triple glazing or HR++.
A bedroom under glass warms up on a sunny day and the heat is still there in the evening. Solar control glass keeps part of the solar heat out, an external screen even more. A roof lantern itself does not open, so in the evening you let the heat out through a window or vent in the wall as soon as it cools down outside. Read more about this risk in overheating under a roof lantern.
A north facing roof lantern gives soft light and little heat, which suits a bedroom. Facing south or west, solar control glass and shading are really needed. Facing east, morning light comes in earliest.
A roof lantern is closed and watertight, so rain or an open window above your bed is never an issue. Fresh air comes through a window or trickle vent in the wall, or through the home's ventilation system. Leave that slightly open at night and the air stays fresh, and you are less likely to see condensation on the glass in the morning.
The glass is out of reach, so the risk in the room itself is small. For roof glazing, laminated safety glass on the inside is a common choice, so no fragments fall down if it breaks.
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