ᐅ Two-story detached house with a gable roof or flat roof

Created on: 6 Apr 2016 13:47
H
hb-julia
Hello,

There is a development plan for a plot of land to be built on, which does not specify a maximum building height but requires that a new house be adapted to the surrounding buildings. These are typical single-family houses with pitched roofs, built around forty years ago.

Now, a so-called townhouse (or urban villa) with the so-called two-thirds compensatory area is preferred. A construction company has already indicated that this would not be a problem. However, if you sign something here and it later turns out that the building authority does not allow such a house to be built, you are tied to that company—even though you might prefer to build a different, approved house with another company.

Therefore, here are my questions:

1) Is the roof of a so-called townhouse officially also classified as a "pitched roof," or is this term reserved only for the aforementioned single-family houses?

2) If a townhouse is approved, could the single-story two-thirds compensatory area be covered with a pitched roof (to allow a possible later conversion, currently just to be used as an attic storage)? Or would it have to be a flat roof?

Thank you very much for all professional answers and personal experiences!
f-pNo14 Apr 2016 10:45
Curly schrieb:
That’s a huge area! Do you have a concrete floor there?

No.
We covered the floor with OSB boards about a year after moving in. It’s designed as a cold roof space (for storage). The ceiling of the rooms below is made of drywall. In between, there is the vapor barrier and insulation.

The size of the walkable area also depends on the roof pitch.
So, probably @Steffen80 would have less usable space, as his roof pitch is lower—unless he has a few centimeters of knee wall planned in the roof.
S
Steffen80
14 Apr 2016 13:11
f-pNo schrieb:
No.
We installed OSB boards on the floor about a year after moving in. It is designed as a cold roof (for storage) only. The ceiling of the rooms below is made of drywall. Between them are the vapor barrier and insulation.

The size of the accessible space also depends on the roof pitch.
So, @Steffen80 would probably have slightly less space available since his roof pitch is lower – unless he has planned for a knee wall in the attic with a few centimeters more height.

30cm (12 inches) knee wall at 25 degrees. That makes it worthwhile. The ceiling is concrete, but also initially designed as a cold roof.

Regards, Steffen
f-pNo14 Apr 2016 13:23
Steffen80 schrieb:
30cm (12 inches) knee wall at 25 degrees.

Then you should have balanced the missing percentages.
S
Sebastian79
14 Apr 2016 13:37
You do know the difference between a cold roof and a warm roof, right?
f-pNo14 Apr 2016 13:51
Sebastian79 schrieb:
But you do know the difference between cold and warm roofs, right?

Hmm – you’re probably right. I used the term more colloquially to mean “not designed as/livable space.” In case anyone misunderstood, here’s a quote from PREFA:

A cold roof, unlike a warm roof, has a ventilation layer between the roof covering and the insulation.
A warm roof is a roof structure where there is no ventilation space between the roof framework and the roof covering!


So the term cold roof should apply in my case as well – the upper floor ceiling is insulated. There is still enough space with air circulation between the roof covering and the upper floor ceiling.

However, I think those reading along here have already understood that my roof is not suitable for living purposes and (as I mentioned in post #31) the insulation was done on the upper floor ceiling.

That said, I am not a professional in construction and tend to express myself in layman’s terms.
S
Sebastian79
14 Apr 2016 13:53
I think a cold roof wouldn’t be suitable for your situation either – they are rarely built nowadays because they are more complex.

My attic is completely unfinished (except for the 60mm (2.4 inches) wood fiberboards) and is still considered a warm roof.