Ground floor approx. 100 sqm, upper floor expandable (planned bathroom, 2 children's rooms, 1 storage room)

What is that thing actually called? Isn't that some kind of mini knee wall?

Ah, a mini knee wall.

Strictly speaking, it is nothing. If it were something, it would be a small knee wall here – but unfortunately one that still requires a knee wall. Whether it has a special name in the roof structure, I can’t say – here it is just there to prevent the rafters from shifting (basically to support the collar beams). So theoretically it is nothing here and more closely related to the knee wall, practically it could be used in a knee wall – but that would only make vacuuming easier, not furnishing. Why bother measuring at all? – There are plans of the ground floor anyway, where you can get the positions from, and deviations between target and actual are basically expected to be in the same range above. So you can “lift up” the measurements of the ground floor with the usual caution of not pushing the last five centimeters to the limit.

So, the meeting took place on Saturday.

We laid out the possible floor plan with battens. We were advised to make the hallway at the top of the stairs 1.5 m wide and to position the doors so that you can walk straight in with furniture, to easily get around the corners. The walls would be 14.5 cm thick with 8 cm insulation. On the side, 1.3 m of hallway would then be sufficient. A bathtub is not a structural problem.

I tried to sketch it.



The following questions remain:

1. Does the shower fit as it is?

2. Is 8 cm insulation sufficient in a 14.5 cm wall? The roof is not insulated until finished.

3. Have I made any mistakes? At least it looks quite consistent to me.

4. The statement was that he did not know that underfloor heating (gas) would work with dry screed on a wooden joist floor. This was justified by the fact that wood does not tolerate the heat well and would "work" (move). I am supposed to contact my plumber again about this. I know that my cousin has underfloor heating (geothermal / collectors) on dry screed. There are special dry screed panels in which the heating pipes are prelaid. Is there a difference between gas/geothermal?

Just as a suggestion: in the children's rooms, thanks to the 2-meter line, it will probably be cabinets with open shelves or ones with sliding doors. In the bedroom, at the moment, no cabinet works that isn't custom-made. If somehow possible in the bathroom, I would move the bedroom wall about 65 cm so that there is room for a cabinet without blocking the window.

Whoops, the bedroom wardrobe is really quite illogical... but it should be possible to solve this by moving the wall as mentioned without making the bathroom illogical.

In the children's room, you could swap the desk and wardrobe, but that would take too much light from the desk. So either retrofit Velux windows later with a bingo win (it was specifically built with the wind bracing using perforated tape so that this is easily possible) or use wardrobes with sliding doors.

The cabinets will probably have to be custom-made. Although there are now also cabinet systems that can be installed under sloping ceilings. But those aren’t cheap either; I would always get a comparative offer from the local carpenter who can make me something exactly suitable. As a rule, that is not more expensive but usually better adapted to individual requirements.

Make the second children's room as small as the other and add the gained space to the bedroom, then there will be room on each side of the bed for a cabinet built into the slope.

I would have left the bedroom on the ground floor and set up a smaller study upstairs. It also has the advantage that later, four people won’t be in each other’s way in the upstairs bathroom in the morning, but that the two bathrooms can be nicely distributed.

Maybe rather like I drew it, then you also have real closet space in all rooms