ᐅ Knee wall at eaves height of 3.50 meters as specified in the building plan / development plan
Created on: 10 Jan 2020 14:26
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EKA0081Hello everyone. Maybe the experts here can help me out a bit. I am currently starting to get more involved with the topic of house construction. We are considering a plot of land of about 750 m² (8,073 sq ft). The development plan states the following regarding eaves height: The eaves height, measured at the intersection of the outer edge of the exterior wall and the underside of the rafters, must not exceed 3.50 m (11 ft 6 in) above the raw floor level of the ground floor. One full storey is permitted. I assume that including a knee wall might be tight within these limits?
Additional details are:
Site coverage ratio: 0.3
Floor area ratio: 0.3
There are no specifications regarding the roof shape.
Thanks in advance.
Additional details are:
Site coverage ratio: 0.3
Floor area ratio: 0.3
There are no specifications regarding the roof shape.
Thanks in advance.
750 sq m (8,073 sq ft) multiplied by 0.3 equals 225 sq m (2,422 sq ft), so you should be able to get enough floor area on the ground floor to also accommodate a few rooms upstairs in the partial upper floor. Let’s assume the worst-case scenario and consider a roof without any knee walls: then you can take the common expression “one-and-a-half storey” quite literally. This means you’ll have about half as much living area upstairs as on the ground floor—so a maximum of 150 sq m (1,615 sq ft) downstairs and 75 sq m (807 sq ft) upstairs, due to the maximum 225 sq m (2,422 sq ft) allowed by the floor area ratio of 0.3. The 150 sq m (1,615 sq ft) on the ground floor translates into a footprint of around 180 to 190 sq m (1,938 to 2,045 sq ft), which also complies with the floor space ratio maximum of 0.3.
The reference point for your ground floor slab level is favorable—other builders often have to deal with manhole covers or completely different reference heights. From the total floor-to-floor height of 350 cm (138 inches), subtracting a storey height of 285 cm (112 inches), leaves us with a 65 cm (26 inches) knee wall height for vacuuming, which is actually quite generous. However, in the overall situation, I would probably recommend a zero knee wall with the roof line starting directly from the floor plate (dormer wall). Even with the mentioned knee wall, you would likely remain below the full storey limit (simplified, this means the upper floor area can be around two-thirds, or in some federal states even three-quarters, of the ground floor area).
In any case, I see that you will mainly have to rely on gable and roof windows for lighting the upper floor. Does the development plan say anything about roof extensions (“dormers”)?
It would be best if you could tell us what exactly you want to build: how many square meters in total, and how much of that is planned for the upper rooms?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
The reference point for your ground floor slab level is favorable—other builders often have to deal with manhole covers or completely different reference heights. From the total floor-to-floor height of 350 cm (138 inches), subtracting a storey height of 285 cm (112 inches), leaves us with a 65 cm (26 inches) knee wall height for vacuuming, which is actually quite generous. However, in the overall situation, I would probably recommend a zero knee wall with the roof line starting directly from the floor plate (dormer wall). Even with the mentioned knee wall, you would likely remain below the full storey limit (simplified, this means the upper floor area can be around two-thirds, or in some federal states even three-quarters, of the ground floor area).
In any case, I see that you will mainly have to rely on gable and roof windows for lighting the upper floor. Does the development plan say anything about roof extensions (“dormers”)?
It would be best if you could tell us what exactly you want to build: how many square meters in total, and how much of that is planned for the upper rooms?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
In the case of a stepped roof, the eaves wouldn’t be at 3.50 m (11.5 ft), right? Usually, sloped ceilings that feel too low are shortened with a knee wall. This is generally not a big issue since the cost of a house with this design doesn’t differ significantly from houses with a standard knee wall (at least that was the case when I built mine). You do save a few bricks. However, the layout needs to be planned differently—meaning more rooms on the ground floor—which, in my opinion, is not a problem either.
kaho674 schrieb:
In a stepped design, the eaves wouldn’t be at 3.50m (11.5 ft), right?Most likely, the development plan doesn’t specify at what setback the upper floor wall height would no longer be relevant. However, it would at least have to affect both eaves sides. So, it wouldn’t result in a significant gain in space, but it would definitely be more expensive.kaho674 schrieb:
Normally, sloped ceilings that feel too low are boxed out. That’s usually not a big issue,Exactly: from the inside, the knee wall and the dwarf wall here make no difference that would be a real problem.https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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