Hello. We currently have a problem. According to the dimensions, we are supposed to build a 9 by 11 meter (30 by 36 feet) house with two bay windows on the sides. These do not extend all the way to the roof peak. The development plan allows for only one story. Now our builder says we can only have a knee wall of 75 cm (30 inches). Is that really the case? The roof pitch is planned to be 45 degrees.
Information is missing. Often it’s just a calculation example, but for that you need figures. And of course, the applicable national building code with the specifications for full stories. When you work with a protractor on a self-drawn section, you can see for yourself how high the knee wall may be. Especially with a 45-degree angle, it is very easy on graph paper.
You probably mean dormer windows by bay windows, otherwise it doesn’t make any sense.
You probably mean dormer windows by bay windows, otherwise it doesn’t make any sense.
Tx-25 schrieb:
with two bay windows on the sides. These do not extend all the way up to the roof ridge. I assume what is meant here are “Frisian gables,” and that these do not reach the ridge. Nevertheless, this roof shape is particularly prone, when combined with a roof pitch around 45°, to encroach into the calculated “risk area” of a full story.
Tx-25 schrieb:
a knee wall of 75cm (30 inches) …I avoid like the plague: such a knee wall is neither fish nor fowl; it does not fully replace a dwarf wall (which is the intended purpose of a knee wall).
Am I being cynical if I further suspect that by “developer” a general contractor might be meant?
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Thank you for the initial explanations. The statement about the Frisian gable and the ridge is correct. We were just sitting at the desk drawing, so we haven’t made much progress yet. If I extend the house by the roof slope, there won’t be any change, right? I mean regarding the floor area on the ground floor and upper floor. I would need to make the house deeper, wouldn’t I? Like widening the gables by about 1 meter (3 feet) for example? Maybe we will also adjust the roof pitch a bit.
Tx-25 schrieb:
If I extend the house with the roof slope You mean extending the rectangular floor plan along the ridge direction? – with a gable roof without transverse gables, this calculation would actually be neutral, but here it’s a bit more complex.
Tx-25 schrieb:
Maybe we’ll also adjust the roof slope a little. What exactly can you adjust? – we still lack a lot of info: eave height, ridge height, their reference points, roof pitch from/to, allowed roof types, restrictions on roof additions, knee wall height with reference basis, …
What do you actually want to achieve: determining the breakeven point, i.e., maximizing usable standing area while avoiding a full additional story?;
and would that even be necessary: how does it relate to the site coverage ratio and floor area ratio (so far, we don’t even know the total floor area, aside from the example of the 99 m² (1065 sq ft) footprint)?
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