Wind-driven rain tightness for floor-to-ceiling windows

Hello dear forum community,

We are getting two double-wing terrace doors on the ground floor, each 2 meters wide. However, these are not calculated to be "floor-to-ceiling," so they are planned with a windowsill. We would like them to be floor-to-ceiling with a 2 cm threshold. The window manufacturer will install them this way but rejects any warranty for driving rain tightness.

As an option, it would also be conceivable for us to have one pane as fixed glazing and the other as a door to open. Even with this variant, the warranty is refused.

Is it generally the case that driving rain tightness is refused for floor-to-ceiling windows with a 2 cm threshold?

Thank you very much!

So a threshold of 2cm is not floor-level ;) There is a DIN for this. What you are describing is a normal patio door. I have never seen a patio door with a windowsill. Normally, a channel is built in front so that no water can accumulate. Every window installer should know and be able to do that... And no, the warranty situation is not normal. We have three sides of glass (floor-level and frameless). It’s not a problem at all.

So with a 2cm threshold it is not floor-to-ceiling ;)
There is a DIN standard for this. What you describe is a normal patio door.
I have never seen a patio door with a windowsill.
Normally, a channel is built in front so that no water can accumulate.
Every window maker should know and be able to do this...
And no, the warranty situation is not normal.
We have glass on three sides (floor-to-ceiling and frameless). It's not an issue at all.

I only just understood this or saw it at our house. On the ground floor, we have exclusively "floor-to-ceiling" window doors on three sides. Now there are "windowsills" everywhere, :) even though we wanted to go outside through these doors. :) Yesterday I asked my husband if you can step on the "windowsills" when going out. He is firmly convinced that they are specifically there to step on ... since he is an engineer, I believe him. ;-)

I will take a photo at some point and provide it later. If this was a wrong decision on our part in any way, we will need the help of the forum anyway. :)

We have not dealt with the topic of driving rain in this context at all and were neither warned nor told about it.

We have several floor-to-ceiling windows. The narrower door at the back is even wheelchair accessible. In front of all doors that can be opened, we have had rain gutters installed. These are also intended to protect against "driving rain." So far, no water has gotten in through the seals. In front of the front door, an additional slot drain was installed. So if water should ever run towards the house, which actually "shouldn't" happen, it could be intercepted beforehand. Just as a "food for thought." We have installed these rain gutters in front of all floor-to-ceiling doors/windows. Also on the terrace in front of the lift/sliding element. Better safe than sorry.

These are also not floor-to-ceiling windows for me, but this is exactly how you do it with a channel.

Just like with , we wanted that and would have, of course, also had a gutter installed in front. But even then, the window manufacturer does not guarantee protection against driving rain (despite a surcharge of 1000,- for both doors). The gutter is installed by the landscape gardener, right?