Find an Installer

How It Works

How does a VELUX skylight rain sensor work?

Have peace of mind that your skylights will close at the first sign of rainy weather.

rain drops on a skylight

From inside your home, the sights and sounds of rain can be pleasant and relaxing, especially from beneath a skylight. Contrarily, the first pitter-patter of droplets on the roof can be equally as alarming if your skylights are ajar. VELUX has the perfect built-in solution to save you the time and energy of scrambling to close your skylights before water gets into your interior space: the rain sensor.

Simply knowing the rain sensor on your VELUX skylight is there in case of unpredictable weather offers a sense of comfort and peace of mind. But how does the rain sensor actually work to ensure your skylights will close in time for an unexpected thunderstorm?

VELUX Solar Powered “Fresh Air” Skylights have a Piezoelectric rain sensor, which means it reacts to sound. The device uses the piezoelectric effect to measure changes in temperature, pressure and sound by converting them to an electrical charge. In this case, the sound of rain hitting the sensor triggers a subtle change in shape (a ‘press’ or ‘squeeze’, as the Greek prefix piezo implies) that generates a voltage to alert the skylight of rain and close it.

P Pr Vss 00039 Thumb 600X400
The rain rain sensor on the Solar Powered "Fresh Air" skylight, seen here, is the small gray box on the right side of the panel attached to the bottom of the skylight.

This particular type of rain sensor replaces an electric one because it would require too much continuous current to draw on the batteries in a solar charged system. But that doesn’t mean you can’t enjoy this feature if a Solar Powered “Fresh Air” Skylight is not your first choice. Our Electric “Fresh Air” Skylights include an integrated moisture sensing rain sensor that will automatically close the skylight with the first drops of water, as well.

Learn more about VELUX No Leak Solar Powered "Fresh Air" Skylights and how they can bring peace of mind, along with fresh air and sunshine, to your home.

Next: How does VELUX Neat® glass work?

Read More