ᐅ What is the height of my knee wall?

Created on: 18 Feb 2014 13:09
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delf
Hello!

We are planning a single-family house on a nice plot of land.

The basic requirements for the house on the plot are:

- Maximum one-story construction
- Gable roof with a 30-degree pitch
- Allowed eaves height 5 m (16 feet)
- Allowed ridge height 9 m (30 feet)

How high is / can / must my knee wall be?
Y
ypg
20 Feb 2014 10:55
Doc.Schnaggls schrieb:

For me, that is no longer considered a full story.

What defines a full story is regulated by the regional building code. Here in Lower Saxony, with a knee wall height of 160cm (63 inches), I would count it as an additional story, even if only a half one... at least that’s what I understand with my knowledge... I don’t know where the original poster is from, but the regulations are quite similar anyway...
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E.Curb
20 Feb 2014 11:18
ypg schrieb:
What qualifies as a full story is defined by the regional building regulations. Here in Lower Saxony, a knee wall height of 160cm (63 inches) would be counted as an additional story, even if only a half one....

That’s correct, the definition of the number of stories is governed by the respective building codes. With a 1.60m (63 inches) knee wall, I would also expect it to be considered a second story. However, a half full story is not a full story and is therefore likely permitted.

Best regards
D
Doc.Schnaggls
20 Feb 2014 11:22
I see it the same way.

The attic is counted as a half story (according to our building authority in Baden-Württemberg, this applies up to a knee wall height of 1.65 m (5 ft 5 in)) and should therefore be eligible for approval under the regulations.

This results in a classic 1.5-story single-family house.
D
delf
20 Feb 2014 11:28
First of all, thanks to Doc.Schnaggls. This is exactly the right explanation when you have no knowledge of the whole subject.

Since I am located near Ulm, the building regulations of Baden-Württemberg most likely apply. They state:

“Full storeys are storeys that extend more than 1.4 m (5 feet) above the average ground level measured at the building corners and are at least 2.3 m (7 feet 7 inches) high, measured from the top edge of the floor to the top edge of the floor of the storey above or to the top edge of the roof covering of the roof above. The average ground level is the arithmetic mean of the ground heights at the building corners. Storeys that are not considered full storeys are
1. storeys used exclusively for housing building services equipment and heating systems,
2. top storeys where the height of 2.3 m (7 feet 7 inches) is present on less than three quarters of the floor area of the storey below.
Voids between the top ceiling and the roof, with a clear height less than that required for habitable rooms according to § 34 section 1, as well as open galleries up to a floor area of 20 m² (215 square feet) are not included.”

Does that mean everything above a knee wall height of 1.4 m (5 feet) counts as an additional full storey? Anything below does not, right? So it would be a single-storey design with a ground floor and first floor with a knee wall height of 1.4 m (5 feet)?
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E.Curb
20 Feb 2014 16:35
No.
If the floor area of the top storey (your attic) with a height of at least 2.30m (7 ft 7 in) is smaller than the floor area of the storey below (in your case, the ground floor), it is not considered a full storey.

This means you should draw a section and mark the 2.30m (7 ft 7 in) line. Then measure the distance from the exterior wall to the intersection with the roof covering at the 2.30m height and draw the 2.30m line on the floor plan. Now you can measure the floor area...... :thumbup:

Regards
E
E.Curb
20 Feb 2014 16:39
Sorry, of course, if the area is smaller than three quarters of the area of the floor below.......