ᐅ Decision: Double French Patio Door – With Mullion or Without?

In our terraced house, where we still rent, we have a French door (Stulp door). We don’t use it very often, but it’s helpful for moving the patio table outside, bringing in new furniture, taking out bulky waste, etc. Without the French door, these tasks would sometimes be very difficult. The second door opens very quickly and easily with one hand (thanks to 2 hinges). For our new build, we will also have a sliding door.

We often keep the second door open to get the wide drying rack through.
We chose a wider drying rack because the narrow one always had to be secured against the wind with heavy stones to prevent it from falling over.

Hello Alex,

abertram schrieb:

Our general contractor convinced me to go with a post. The main argument was that a door with a post is safer.

For a standard size of 2.01 x 2.135 meters (6 ft 7 in x 7 ft), a design without a central post is now the norm; therefore, I consider your provider’s concerns unfounded. Only from a window width of about 1.135 meters (3 ft 9 in) per sash, due to the weight of triple glazing, is a mullion a sensible choice—especially if laminated safety glass (LSG) is involved. The warranty period can also be passed by a window of this size without a mullion, but after that...

Edit: Mullion replaced central post.

Edit 2: Mullion:

**This profile attached to the sash divides the window inconspicuously into two or more parts. The mullion profile is part of the window sash and opens together with it. The mullion is not fixed and is therefore also called a loose post.

** borrowed from Veka®

Regards, Bauexperte

Hello construction expert,

I’m a bit confused right now. A “Stulp” refers to the fixed central post, correct? Are “Stulp windows” windows without this central post? Because one of the window sashes takes over the function of the Stulp, or is that why?
When you say “without Stulp,” does that mean without the central post? Our window is even a bit smaller, 186 cm (73 inches) rough opening dimensions, so about 90 cm (35 inches) per sash. The size shouldn’t be an issue in that case.

Regards,
Alex

Hello Alex,

argh – I fell for it again, sorry; I replaced "Stulp" with "mullion" ops:

abertram schrieb:

Because one window takes over the function of the stulp, or why?

Yes. Among other things, that’s why you need to specify which sash you want to open first when ordering the windows!

abertram schrieb:

If you write without stulp, that means without mullion, right?

Yes.

abertram schrieb:

Our window is even a bit smaller, 186cm (73 inches) rough opening dimensions, so about 90cm (35 inches) per sash. The dimensions shouldn’t matter.

Then it’s definitely no problem at all to do without a fixed mullion!

Regards, Bauexperte

We only open the second leaf of our double patio door when we need to carry something bulky (clothes drying rack, furniture, etc.) in or out. Opening it is really no hassle. Just lift the small red lever and open the door. We have never regretted it.