Mal Bauen
2023-03-18 22:24:42
- #1
The search in the forum and on the internet has so far been unsuccessful, so I am asking the question here:
In our house construction project, the architect expects a "very low" knee wall when installing a shed dormer in the attic and has named a cross gable as a potential alternative. However, we don't really want this due to the appearance and shading of the ground floor. I wanted to understand the whole thing a little better and measured in our current rental apartment with a shed dormer:

I do not know the thickness of the rental apartment's roof insulation, but I am now simply assuming "current standard" (year of construction 2019). The windowsill in the dormer is about 27 cm higher than the knee wall, each measured from the inside at floor level.
Can it be assumed that with a lower knee wall, the sill height can also be linearly reduced by the same amount?
In other words: Would I get a windowsill height of about 117 cm with a knee wall of, for example, 90 cm?
The windows in the rental apartment are, in my opinion, way too high. For our own build, I am now looking for the sweet spot between "sufficiently high knee wall" and "sufficiently deep dormer windows."
I am grateful for any assessment (or experience reports, in case anyone wants to measure at home).
In our house construction project, the architect expects a "very low" knee wall when installing a shed dormer in the attic and has named a cross gable as a potential alternative. However, we don't really want this due to the appearance and shading of the ground floor. I wanted to understand the whole thing a little better and measured in our current rental apartment with a shed dormer:
I do not know the thickness of the rental apartment's roof insulation, but I am now simply assuming "current standard" (year of construction 2019). The windowsill in the dormer is about 27 cm higher than the knee wall, each measured from the inside at floor level.
Can it be assumed that with a lower knee wall, the sill height can also be linearly reduced by the same amount?
In other words: Would I get a windowsill height of about 117 cm with a knee wall of, for example, 90 cm?
The windows in the rental apartment are, in my opinion, way too high. For our own build, I am now looking for the sweet spot between "sufficiently high knee wall" and "sufficiently deep dormer windows."
I am grateful for any assessment (or experience reports, in case anyone wants to measure at home).