Windows with roller shutters in new construction, solution for planning problem?

Hello,

we are currently planning a new construction of a single-family house with an architect. We have a problem with the selection and installation of the windows.

The walls are made of 20 cm calcium silicate bricks, with 16 cm mineral wool insulation on top. So far, A has planned and drawn in facing roller shutters as can be seen in the attached detail.
Yesterday we visited a window manufacturer who pointed out that with this type of installation, plastic spacer profiles with 60 mm have to be installed not only at the top (as shown in the detail) but also laterally on both sides.

This is because with facing roller shutters (=external inspection), the roller shutter guide rails must be removable in order to remove the inspection cover. This means the rails cannot be plastered over. Therefore, they must be installed on the window frame next to the plaster and cannot be plastered in.
Furthermore, an insulation layer must also be applied around the masonry.
Overall, this means that, in addition to the outer window frame with 76 mm, an additional 60 mm plastic frame profile is required, which would then be visible from the inside if it is not specially clad (as already drawn in the detail at the top edge).

Since both the spacer profiles and the necessary cladding on the top and sides cost considerable extra money, we asked for an alternative solution.
And here comes the next problem.

One possible alternative would have been to use windows with built-on roller shutters and internal inspection. Although these solve the above-mentioned problems, they are probably not so ideal energetically due to thinner insulation layers in certain parts of the roller shutter box.

Another alternative might have been to install the windows with built-on roller shutters into the insulation layer (?), but this conflicts with our wish for RC2-certified screwing of the frames.

I hope I have not misrepresented anything; it was all a bit complex at once, so please don’t take the representations as fixed.
My question would be mainly:
How could a safe, sensible, and cost-effective selection and installation of windows with roller shutters look like with the wall structure existing here?

Once again, the given and required details:
Wall structure: 20 cm calcium silicate bricks + 16 cm mineral wool
Required window U-value according to energy saving ordinance calculation min. 0.94 (=triple glazing)
RC2 certified installation and mounting
Roller shutters on all doors and windows
Ideally, the roller shutters can be plastered from the outside, current wish of my wife
Doors up to max. 120 cm width (installation size) and 240 cm height (without roller shutter)
Windows up to 2 m width and 1.63 m height (2-leaf)

I hope I have presented the problem well and correctly and would be very happy if someone could give me some advice.

Best regards to all,

Marc

One possible alternative would have been to use windows with external roller shutters and internal revision. These indeed resolve the aforementioned problems, but due to thinner insulation layers in certain areas of the roller shutter box, they are probably not so ideal energetically.

But also no big deal and very much state of the art and is executed like this everywhere every day. For you, this is the cheapest and simplest way to get out of the water dry in this case. Without complicated solutions and additional thermal bridges.

Energetically, this is not a drama at all. You take insulated boxes and that's it. It is also much less complicated than the sketched construction, so fewer sources of error. An insulated roller shutter box always has better U-values than the window below it... Why the alarm?

I rather wonder why people are so obsessed in new buildings, despite alternatives, to plan ugly cover boxes.

Thank you very much for the answers first of all!

Where exactly are the windows then located, right at the front edge towards the insulation, or in the middle of the wall, or how is it then?
Depending on that, one would then also need to insulate the side parts of the wall, right?

Does anyone possibly have a sectional drawing or sketch on hand of how it looks then with the [Aufsatzrollläden] and the thick insulation?

20cm sand-lime brick should be enough as a wall to completely hide the entire element within the wall. Of course, this depends on the construction type of the windows and the box. You have to check here. The exact plane in which the window is located is up to you or your architect. Alternatively, the window manufacturers sometimes have a say in this as well. But usually it looks like this, although it can also be flush with the exterior wall or completely within the insulation.

Thank you! Due to the RC2 issue, the frame is supposed to be set into the wall, if I understood the window builder correctly. But this way, the side profiles would definitely be obsolete, which is already great.