Top edge of finished floor and road construction height: poorly planned?

So if I interpret the plan correctly, your terrain (!) is about 20-30 cm higher than the construction road. Get the measurements for the final construction - keep in mind that the road is usually higher in the middle (near the curb) and slopes down towards the edges. You can see exactly how that looks in the cross-section.

If this is not a special structure, I claim that it will barely align with the planned top edge of the finished floor or you will need to remove some terrain so that it is level with the curb edge.

However, if you still have room to go up, amend the building application if necessary. That is not a big effort and will be approved as long as the eave and ridge heights still allow it.

Best regards
Dirk Grafe

Hello Dirk,

one of us is interpreting the plan incorrectly. According to the architect, my terrain should be 70.50. Therefore, it is almost everywhere lower than the planned height of the street edge (street height +8 cm for the curb):

70.50, 70.54, 70.57, 70.60, 70.65, 70.67, 70.64, 70.58, 70.48

In my opinion, these are your current ground heights at your border. The construction road is planned to be about 20-30cm lower - it is questionable whether the construction road was built as planned.

What are the reference points for the surveyor when carrying out a rough/fine staking out? The KS heights of the street shafts? Or KD heights? Or both?

Both.

For a rough staking, usually no elevation is given or – if a signal can be received – a GPS elevation is determined. This is accurate to about 3-5 cm without a specific local reference point, which is sufficient for pushing off or excavation. Higher effort is only made if it is already suspected that it depends on the last centimeter on the building plot. However, this is extremely rare.

For fine staking (or possibly even earlier, see above), more precise heights are transmitted. There are different possibilities for this:

1. Best accuracy: transfer of the height by leveling from an official height reference point; this is only done in fine staking if it is suspected or already known that the manhole cover cadastre does not fit at all and at the same time every centimeter counts. Reasons for this can be that only a slight slope is available and/or the building heights/setback lines are fully utilized and a neighbor is already pawing or threatening with a lawyer.

2. Normally sufficient: the surveyor has the manhole cover cadastre available and checks it using GPS measurement of the manhole covers (MC) and measurement of the corresponding invert depths. This uncovers deviations of the – generally error-prone – MC cadastre or changes in the MC heights. The inverts remain the same as long as the entire sewerage is not newly installed. Both together, i.e., MC cadastre and control measurement by GPS, do not claim absolute accuracy, but the relative height difference between the invert level into which drainage is made and the height then given by leveling in the staking plan (e.g., nail on the battens, the beam height itself, or similar) is then available with high accuracy.

Case 2, to put it bluntly, only ensures that the water flows in the right direction. If, for example, there are problems with the single-family house and/or ridge height and/or terrain height/setback lines with removed or added terrain, then this only helps to a limited extent in the end.

I hope I have not overwhelmed you with the answer; if you have further questions, it makes little sense to ask them in the forum. Then feel free to contact me via private message or call the office, contact details are in the profile.

Best regards Dirk Grafe