Window size in the plan - How is it correctly to be understood?

Hello everyone,

I have a problem understanding something and I am looking forward to your help!

How is the specification of the window size in the construction drawing to be correctly understood?

The specification of the parapet height indicates the height up to the edge of the wall. Accordingly, a parapet height of 1.00 m corresponds to four rows of bricks, correct?

The size of the wall opening for the window is given in the construction drawing, for example, with a width of 1.635 m and a height of 1.46 m.

So, after completion, the mason will leave me a hole in the wall with the size 1.635x1.46 m, right?

But if I plan to have a top-mounted roller shutter box for my windows with a height of 30 cm, then I actually need a wall opening of 1.635x1.76 m.
Does this also have to be specified like this in the drawing?
Is it enough to add a note "Attention with roller shutter box" and then all experts will understand?
Or is it to be understood differently?

In the end, I want to have the correct wall opening, so I don't have to live without roller shutters in the end.

Thanks in advance to all of you!

Show me the drawing.

With your calculation of 176 at 100 cm parapet height, you would have to have a room height of nearly 290 cm.

It is also always important whether the parapet height is measured from the top of the raw floor (mason) or from the top of the finished floor. If from the raw floor, then 100 cm parapet height quickly becomes only 82 to 85 cm with the finished floor. This is often relevant, for example, in kitchen planning.

How is the specification for the window size in the construction drawing to be correctly understood?

"Correct" (= usual) is to relate the measurement to the window - and to check in the "section" how the roller shutter box is to be designed.

Is a note "Beware of roller shutter box" still missing and then all experts will know?

Unfortunately, you are right that such ambiguities lead to misunderstandings. On site, unfortunately, many things are done "as always" – you simply cannot write that big and bold enough, especially if the foreman previously worked for a company with different habits.

When in doubt, better point out "one time too often" that something is specified unambiguously. This especially applies to the tricky...

It is also always important whether the parapet height is meant from the top edge of the rough floor (mason) or from the top edge of the finished floor.

.. this reference, whether the dimension is to be understood "before Christ or with sausage tax," is just as important as the correct number itself.

With us, it was exactly the same in the plans as with you. The window size was given without a roller shutter and it was then placed on top. However, it was stated in the plan that roller shutters would be installed; "RK" was noted on each window in the execution plan. From the 1m parapet height, we ended up with 87cm finished parapet height (1m - screed + windowsill).

Best regards
Sabine

Finished parapet height I would rather define as follows:

It is a dimensional specification from construction and refers to the distance between the finished floor and the parapet. The latter is the transition between a solid structure and an opening. For example, there are balcony or window parapets. You measure the parapet height from the floor to the underside of the windowsill, or more generally expressed, to the beginning of the opening.

Up to the beginning of the opening, this also corresponds to the measurement in the shell construction.
In the finished construction, always without the windowsill, it is also useful for kitchen planning.

But it was stated in the plan that roller shutters would be installed; “RK” was noted at every window in the execution plan.

Unfortunately, that alone does not indicate whether it is a classic roller shutter box installed by the shell builder as a built-in element, or a roller shutter box attached to the window element (which the window manufacturer then installs as a complete module).

For the question at hand, however, it is more relevant whether the window even gets a roller shutter box or not: if not, it gets a lintel; and if yes, the floor slab usually follows immediately after the roller shutter box.

The practical difference between this or that roller shutter box variant is that the box is either installed individually in front of the floor slab, or the box is attached as an element with the window after the floor slab has already been constructed.

Construction workers do not like to read much – the best way to communicate this to them is by whether roller shutter boxes are lying around the construction site.