ᐅ Is the excavation suitable for backfilling?

Created on: 3 Apr 2020 21:31
R
Reini1234
Hello everyone,

I need to raise my terrace by about 70cm (28 inches) to make it level with our house. This will include 50cm (20 inches) of fill material and 20cm (8 inches) of topsoil, which corresponds roughly to 90 cubic meters (118 cubic yards) and 35 cubic meters (46 cubic yards). Permits are already in place.

I would like to have the fill material delivered from another construction site. There is a soil report available, which I will summarize as follows:


Gedruckte Seite mit technischer Bau-Tabelle und Text




Here are some recent photos:

Großer Erdhaufen auf einem Baugrundstück vor einem Haus, sichtbare Erdarbeiten am Fundament.

Großer Erdhügel auf Baustelle in Wohngegend, Bodenarbeiten vor Rohbau sichtbar.

Großer Erdhügel auf Baugrundstück mit benachbarten Häusern im Hintergrund



The soil is described by the owner as clayey. Do you think I can use this material safely for the fill? The note about soil moisture in the report is a bit concerning to me.

Additionally, below my retaining wall, there is a slope that levels out at the bottom. The area has been disturbed by wild boars. I want to roughly rototill it now so that I can later maintain it with a flail mower. Are there any appropriate machines available that can handle areas with stones?


Modernes Einfamilienhaus auf Hanglage mit Terrasse und Stuetzmauer aus Naturstein
tomtom794 Apr 2020 11:52
As long as it is not intended as a substructure for the terrace, there is absolutely no objection.
Vicky Pedia4 Apr 2020 12:08
@tomtom79 That's right, suitable only for purely decorative purposes, definitely not under a terrace. As mentioned earlier, it will continue to settle over the years, and you'll keep regretting it. Clay-rich soil behaves like modeling clay and cannot be compacted.
R
Reini1234
4 Apr 2020 21:58
Just a quick clarification:

The terrace is planned to be built below the balcony (see image in Post #6). So the balcony essentially acts as the roof of the terrace. The entire surrounding area needs to be filled up by 70 cm (28 inches). Reference points include, for example, the protruding gray inspection shaft and the green insulation below the basement. Is the ground suitable for this?
M4rvin4 Apr 2020 23:35
Why do you need to add fill? Just make the terrace level with the house and then add some fresh topsoil for the lawn. That way, you basically have a veranda that is slightly higher than the lawn. I don’t see that as a problem!

Instead, I would prefer to terrace your slope using the excavation and make it usable.
R
Reini1234
5 Apr 2020 10:07
That would indeed be an option, but the inspection shaft would still protrude. It was originally designed to the finished height.

Is there any suitable plow attachment or similar equipment for the slope to level out the craters?
H
haydee
5 Apr 2020 11:00
Milling and pulling straight.
The plow goes too deep and is very rough.
It must be suitable for the slope or light enough that you can still control and manage it.