ᐅ First along the short side of the house

Molybdean schrieb:

The east/west orientation is not ideal.

This is simply not true as a general statement.
Often, only the total yield per kWp is considered.
However, the performance curve plays a significant role in practice. With an east-west system, you have a longer period of own energy production and a lower peak load. With the same kWp capacity, a south-facing roof with the same angle would yield about 10-15% more total energy than an east/west roof.
For people who get up in the morning and go to bed in the evening, an east/west system helps increase self-consumption (the economic factor!) due to the longer time window of electricity generation without battery use.
If you also consider that using two roof sections provides more square meters than just one, it becomes clear that the "power loss" in absolute terms can easily be compensated by adding a few more modules.
Those who calculate precisely and take into account the typical daily consumption pattern of a household often find that an east-west system has a shorter payback period.

Build your house based on what suits you best from the inside out. The photovoltaic orientation is a secondary factor here.

What is the exact roof pitch requirement?
My follow-up question remains unanswered: why do you suspect there is a structural issue?

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11ant schrieb:

What is the exact roof pitch requirement?
My question about why you suspect a structural complication is still unanswered.

We do not have a specific requirement; we are building according to §34. Currently, due to the attic, the pitch is 45 degrees. The suspicion comes from a layperson and the fact that the construction company could not deny additional structural work.

With a 45° roof pitch and a knee wall height of 1.0 m (3.3 ft), a height of 2.3 m (7.5 ft) is reached after 1.3 m (4.3 ft) — so over a distance of 7.4 m (24.3 ft) in a 10 m (32.8 ft) deep house. In a region where two-thirds of the roof height counts as a full story, the full-story line is already broken with this alone, and in regions where three-quarters count, there is practically no allowance left to add dormers (also called "gaubes"). The structural "additional effort" consists of longer rafters compared to the long side being the eaves side (although one central purlin per roof side would also be recommended here in reverse). Without any dormer, it also follows that none can be planned to gain more headroom for the staircase. The staircase then inevitably ends up in the area of the gable where the best window opportunities would be. Consider alternatives with 40°, 38°, or even 35° roof pitches and a higher knee wall (though I would not increase it significantly beyond 1.4 m (4.6 ft)). With a 45° roof pitch — I would almost call this a roof steepness here — the maximum efficiency for photovoltaics is practically lost anyway. Functional floor plan layouts here will resemble classic terraced houses or semi-detached houses; the "extra meter" (8 instead of 7 or 6 m) mainly allows more space in the guest toilet/wardrobe area, and the staircase can be a half-turn rather than just straight up and down, or even have a landing thanks to the additional meter. The entrance will be located on the short side. Overall, we are talking about around 100 to 110 square meters (1,076 to 1,184 square feet), and I see a guest room or a third child’s bedroom as nearly impossible here. In terms of area (observe 11ant’s basement rule!), utility rooms and storage spaces benefit greatly from having a basement.

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11ant schrieb:

The additional structural effort is due to the eaves side being shorter compared to the long side when using longer rafters.

Correction: "(den)" instead of the two "der".

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11ant schrieb:

The additional structural effort results from rafters that are longer along what is the eaves side compared to the longer side of the building.

Correction correction: it's nice that smileys are allowed again, but it would be great if the correction timeout could also be set back to the original ten minutes :-(

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