Terrace on a hillside on stilts - wood or steel better?

A L-block at 2.55 height will cost about 430€ including installation. I am more concerned about the removal of the excavation at the moment. Our carpenter will make us an offer in the next few days based on my sketch. In other words, supports made of steel, the rest made of wood. Tomorrow and Thursday I will visit two metalworkers and get offers for a pure steel construction with wooden floorboards.

My construction coordinator said the terrace would also need to be sealed at the bottom. Since the main terrace will not be down there, this will then only be a possible option.

As I said, everything is very exciting and many things will be decided in the next 1-2 weeks. The submission planning is supposed to be sent out in 3-4 weeks.

Hello Zaba12

Can you access the house from the back? A 10³ container of mixed soil costs about 330 euros here (approx. 16 tons) all inclusive (delivery and pickup including disposal)
As I said, a 30 cm masonry will cost you significantly less than the L-shaped stones. In the end, it’s the same.

Steven

Tomorrow and Thursday I will be at 2 metalworkers getting quotes for a pure steel construction with wooden planks. The construction coordinator insisted on this to check if steel will be significantly more expensive. Meanwhile, after a lot of research, I have found out that the terrace construction on this scale will cost approximately €10k without steel supports. €5k for the railing. €2k for the point foundation. Now the steel supports and excavation are still missing. At least I can also estimate the excavation without major contamination (transport and disposal €15k). Now I am looking for alternatives for this.

Hello Zaba12

Is it possible to access the house from the back? A 10³ container of mixed soil costs about 330 euros here complete (approx. 16 tons) (delivery and pick-up including disposal). As I said, a 30cm masonry will cost you significantly less than the L-stones. In the end, it’s the same.

Steven

I think you have a number mix-up there, 1t equals 1.6m³ and not the other way around. Besides, here an 8m³ container costs 539€ gross including pick-up and disposal.

The earth excavation will already be expensive enough. For uncontaminated earth excavation, our structural engineer wants 17.61€ per m³. What’s unfortunate for me is that I know our landfill charges 15€ per ton. Sometimes it would be better to remain ignorant.

EDIT: Another idea would be to at least form the supports with 2.55 L-bricks.

I massively doubt their suitability for this purpose.

I think you have a transposition error there, 1t is 1.6m³ and not the other way around.

Hello Zaba12

No, that's correct. 1m³ is, depending on compaction, about 1.6 tons.
Soil is heavier than water.

Steven