Practical testing …
As we already mentioned at the beginning, there were much too high temperatures in the attic floor beyond 30°C. Of course, the roof insulation also plays a role, but not only! By looking at the roof window with the thermal imaging camera, it soon gets clear how much the roof window heats up in the summer time.
In the middle area, it is approximately 53°C up to 57,5°C – thus, there is practically a heating hanging on the wall that is fully turned on despite of the warm exterior temperatures!
And that’s just the little Velux window. The large Velux window has an area of just under one square metre. Of course, we have also provided it with a heat protection awning. During the measurement, the internal blackout blind was closed. Not only for the previous reduction of the attic temperature, but also because thermal imaging cameras on reflective surfaces such as glass would not provide correct measurements.
By the way, this is how the completely mounted Velux blackout blind looks like, which can be pulled manually from the inside in front of the roof window.
So a solution must be found to reduce the heat in the attic. The cheapest solution is the manual sun protection blind. The previously installed heat protection awning from Velux would like to remedy the situation by preventing the sunlight from reaching the window pane and/or the blackout or privacy protection roller blind in the first place.
After approx. 20 minutes the heat protection awning is installed together with the blackout blind. As can be seen very clearly in the picture, the external sun protection roller blind is now simply hooked into the screwed-on hook and automatically extends over the entire window when closed.
But does the heat protection awning really manage to reduce the heat at the window?
Definitely!
The result is amazing! Because the heat of the sun’s rays is now already intercepted in front of the window pane and no longer hits the pane or the internal blackout blind with full force, the temperature could be reduced by almost 20°C to 35.5 to 38.5°C thanks to the heat protection awning!
We were so surprised about this positive result that we wanted to show the temperature differences here on Funkyhome.de. What is still pending, however, is a long-term test. Because we will only be able to determine after a few weeks or summer months how much the attic temperature can ultimately be reduced by lowering the window temperature. However, we can already imagine that a heating system that is switched on in summer with almost 60°C heats up a room considerably and this is exactly what the roof windows did before in strong sunshine.
Velux Heat Protection Awning Result and general impression …