ᐅ Which Roof Style Is Best for a Challenging Building Layout?
Created on: 21 Dec 2025 21:09
B
Bauherrin2024
Hello everyone,
Our plot (Bavaria) has a very restrictive development plan from 1981. It allows a pitched roof with dormers (I+D), no knee wall, no dormers, gable or hip roof, with a pitch of 18-35°. We recently had a pre-consultation with the building authority and submitted a preliminary inquiry. The following was proposed:
Two full stories, maximum eaves height 6 m (20 feet), gable, hip, or flat roof.
BUT: maximum roof pitch 10 degrees. (I had requested 18 degrees, which would not have required a special exemption.)
Alternatively:
Still pitched roof with dormers (I+D), knee wall max. 1 m (3.3 feet), then the roof pitch can be increased to 42 degrees.
I understand that they want to limit the maximum building height. At first, I was very happy that they would actually approve two full stories, as I would prefer to avoid roof slopes. But the more I read, the more disappointed I become. A gable or hip roof with a 10-degree pitch doesn’t seem like such a great idea, both stylistically and because it would require an expensive, watertight subroof construction. We would least prefer a flat roof because we imagine a “nice, warm house with red tiles and yellow facade color.” At most, a flat roof with 10 degrees (which would be more like a single-pitch roof?) combined with tiles and roof overhang.
I am really confused. Could you share your thoughts on this? If anything is unclear, feel free to ask :-) Many thanks!!
Our plot (Bavaria) has a very restrictive development plan from 1981. It allows a pitched roof with dormers (I+D), no knee wall, no dormers, gable or hip roof, with a pitch of 18-35°. We recently had a pre-consultation with the building authority and submitted a preliminary inquiry. The following was proposed:
Two full stories, maximum eaves height 6 m (20 feet), gable, hip, or flat roof.
BUT: maximum roof pitch 10 degrees. (I had requested 18 degrees, which would not have required a special exemption.)
Alternatively:
Still pitched roof with dormers (I+D), knee wall max. 1 m (3.3 feet), then the roof pitch can be increased to 42 degrees.
I understand that they want to limit the maximum building height. At first, I was very happy that they would actually approve two full stories, as I would prefer to avoid roof slopes. But the more I read, the more disappointed I become. A gable or hip roof with a 10-degree pitch doesn’t seem like such a great idea, both stylistically and because it would require an expensive, watertight subroof construction. We would least prefer a flat roof because we imagine a “nice, warm house with red tiles and yellow facade color.” At most, a flat roof with 10 degrees (which would be more like a single-pitch roof?) combined with tiles and roof overhang.
I am really confused. Could you share your thoughts on this? If anything is unclear, feel free to ask :-) Many thanks!!
Bauherrin2024 schrieb:
I don’t quite understand. Do you mean skylights? On the “non-roof side,” there are always floor-to-ceiling windows in the middle, and on the roof side, there are usually none in the wall.He probably means not skylights, but the option to install dormers. With a gable roof and a small knee wall, dormers are a good solution. The higher the knee wall, the more “not possible,” some people say here in the forum. Some install so-called ribbon windows just below the roof line at about 2 meters (6.5 feet) knee wall height. This can work for bathrooms or utility rooms but usually doesn’t serve as a view and is therefore less suitable for living spaces.
In my opinion, though, nice dormers can also be built with, for example, a 160 cm (63 inch) knee wall. Whether that fits the desired architectural style is another question, as is whether it’s actually needed. After all, a house design is planned accordingly, and in this case, the design is not known or doesn’t yet exist.
Therefore, I can only recommend having an architect design the appropriate house. This might make discussions about hypothetical roofs and imagined problems unnecessary.
Papierturm schrieb:
Properly constructed flat roofs are just as reliable as other properly constructed roofs.
The only disadvantage of flat roofs is that if there is ever a problem (probably only after several decades), it can be somewhat more difficult to locate the source of the damage. Even though nowadays "designed flat roofs" are on a completely different level compared to the modern "omitted pitched roofs" from half a century ago with bitumen roofing felt laid on the top floor ceiling: water needs a slope to drain—if it stands still, it causes damage. This damage then becomes large enough to be quickly noticeable. The main problem with leaking flat roofs is that at roof penetrations (vent pipes for drainage in bathrooms and similar), the rate at which water seeps into the roof structure is greater than the intended flow rate in the desired direction. A watertight flat roof is noticeably more expensive than a pitched roof due to various specialized materials and significantly more labor-intensive detailing. Waterproofing materials are sensitive to UV radiation, which makes the roof maintenance-intensive. A flat roof is therefore always a luxury. Unfortunately, it has many more fans than could all be high earners. From a building consultant’s point of view, it is not an adequate alternative that would be merely a matter of personal taste.
derdietmar schrieb:
If the footprint of the house is large enough, it is possible to increase the knee wall height by adding stud walls. Behind the stud wall, there is then a crawl space used for storage. I would only consider a sequence of knee walls and dwarf walls (this is the term for these “stud walls”) as a very last resort. The under-eaves space (the so-called crawl space) implies disproportionate effort in terms of managing the thermal envelope boundary.
Bauherrin2024 schrieb:
Honestly, I find it much nicer with the roof overhang and tiles (which you can at least roughly see) than a cube without a roof :'D I was already wondering what you meant by tiles on a flat roof. So you want to fake a pitched roof like a Potemkin facade: “two oranges in the hair and bananas at the hip, what Juanita likes, soon the whole world will wear” ;-).
If you ask me, this belongs in the category "McMansion Hell, Frankenstein Edition"—basically a Tuscan Bauhaus. Will there be an apple pouch added next (uh, I meant: glass blocks)?
ypg schrieb:
Therefore, I can only advise having an architect design the right house. Maybe then the discussion about imaginary roofs and hypothetical problems would be unnecessary. “Misleading,” not “imaginary.” As I already told the original poster in April two years ago, a systematic approach is advisable. Concrete planning (by or with professionals) would have long since led to a solution—but apparently, that is not the desire when abstract thinking is much more fun. Meanwhile, the cost increases could have covered either a regular garage or a high-end terrace.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
nordanney schrieb:
P.S. A flat roof today is technically and in terms of lifespan equivalent to a pitched roof.A tiled roof easily lasts 50 years without any repairs. A flat roof, depending on quality, less than 20 years.M
motorradsilke22 Dec 2025 14:43Grundaus schrieb:
A tile roof easily lasts 50 years without any repairs. A flat roof, depending on quality, doesn’t even reach 20.Metal roof tiles are also available for low slopes, and they easily last 30 years.B
Bauherrin202422 Dec 2025 15:06Thank you very much for your additional comments! As mentioned, dormers were never promised, so unfortunately, considering this option does not help much.
Of course, we have an architect. He has been on vacation since we received the notice a week ago and may not be infallible either. Therefore, additional ideas and perspectives from outside are certainly helpful.
I would rather not engage in the speculation that it must be my "unusual approach" that caused us to put the house construction on hold for two years. :-)
Of course, we have an architect. He has been on vacation since we received the notice a week ago and may not be infallible either. Therefore, additional ideas and perspectives from outside are certainly helpful.
I would rather not engage in the speculation that it must be my "unusual approach" that caused us to put the house construction on hold for two years. :-)
N
nordanney22 Dec 2025 15:15Grundaus schrieb:
A tiled roof easily lasts 50 years without any repairs. Flat roofs, depending on quality, don’t even reach 20 years.A modern flat roof (I’m not talking about completely flat "bathtub" designs) can easily last 40 years. Of course, higher standards for proper construction and occasional maintenance are necessary. Flat roofs lasting only 20 years are a thing of the last century.Similar topics