The difference between skylights and roof windows is quite important, especially if you are involved in construction, renovation or energy efficiency.
Here's a clear overview:
Domes
Features:
- Generally spherical, pyramidal or flat and often of plastic (acrylic, polycarbonate) or glass.
- Are mainly placed on flat or slightly sloping roofs.
- Are used to daylight to enter areas where there is no sloping roof construction, such as bathrooms, hallways or warehouses.
- Some models may open for ventilation, but many are solid.
- Can also be provided with sun protection or HR++ glass for better insulation.
Advantages:
- Plenty of light, even in cloudy weather.
- Easy to install on flat roofs.
- Inexpensive compared to large skylights.
Disadvantages:
- Limited view (you look straight up).
- Insulation is often slightly less than with high-quality skylights (depending on the type).
Roof windows (skylights)
Features:
- Are built into sloping roofs (as in attic rooms).
- Usually made of wood or plastic with HR++ or triple glazing.
- Be able to open and tilt (manual or electric).
- Well-known brands: VELUX, Fakro, Roto, etc.
Advantages:
- Brings plenty of daylight and ventilation in sloping roof spaces.
- Gives prospect outside.
- Very good insulation and sound insulation (depending on type).
Disadvantages:
- Only suitable for sloping roofs.
- Something more expensive and more complex to install than a roof dome.
