ᐅ Flat roof without parapet wall

Created on: 29 Feb 2016 21:11
J
jochi79
J
jochi79
29 Feb 2016 21:11
Hello everyone,

I have a question for all the legal experts:

We recently received approval for a plot of land in southern Germany near the beautiful Lake Constance. According to the development plan, the building must have a flat roof with two full stories, and a maximum height of 6.90 meters (22.6 feet).

In our neighborhood, there is a relatively new house with a very shallow, single-sloped roof with a pitch of about 6°. Since I have read on various sites that a flat roof is defined as having a pitch up to 7° or 9°, I am now wondering whether such a house would be allowed to be built.

Basically, it would be a flat-roofed house but without a parapet, meaning the roof slope would be visible.

Can someone help me with this?

Thank you very much
H
halve85
18 Jan 2018 14:56
Yes, I’m also interested in this... if FD is specified in the development plan, what is allowed and what is not in terms of a typical flat roof in the Bauhaus style? Especially regarding the roof covering and eaves projections...
11ant18 Jan 2018 15:51
halve85 schrieb:
If the building development plan specifies FD, what is possible and what does not directly correspond to a typical flat roof in the Bauhaus style?

I would say: if the development plan does not specify the roof pitch, you have relatively free scope. In my opinion, a flat roof is not necessarily characterized by a parapet of consistent height and/or the absence of an eave, but more importantly, its pitch is so low that it doesn’t even allow for an attic space.

However, keep in mind that you cannot simply build a sloped roof arbitrarily flat: around 20° pitch, the choice of suitable roofing materials changes considerably. A metal roof can also have an overhang, but felt/membrane/gravel roofs require the parapet around them.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
H
halve85
18 Jan 2018 15:57
If no slope is specified and only FD is mentioned, the final approval depends on the building authority’s discretion... hmm, the new development is next to a bungalow neighborhood from the 1970s... all of which are very flat, without any experiments (and potentially prone to leaks). How far “creative” interpretations of the FD will be approved is therefore quite uncertain.
11ant18 Jan 2018 16:12
A zoning plan is simply a zoning plan; it does not simultaneously impose an insertion requirement in the surrounding existing buildings. Administrative lawyers are not construction engineers; they might already define the "boundary" at a 10° roof pitch.

On the other hand, what exactly are you planning to do?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
H
halve85
18 Jan 2018 16:34
To be honest, I’m not yet sure what exactly I want to do. I’m simply not a fan of flat roofs, but the zoning plan only permits flat roofs. So, I’m looking for alternatives...

From what I’ve read so far, designs that aren’t typical flat roofs (for example, fake pitched roofs with parapets) tend to cause more problems than a well-executed flat roof designed as an inverted roof. Ideally, I would also like an eave overhang and gutters instead of these water collection boxes.