ᐅ Recycled crushed stone for foundation slab

Hello,

what is your opinion on buying recycled crushed stone for the house’s foundation slab? We need to overcome a relatively large height (1.2 m (4 feet)), and this could save a considerable amount of money. So far, I have heard mixed opinions but no real explanations.

What are your thoughts on this topic?

Start by placing about one meter (3 feet) of fill sand, compacting it in layers and watering it well. May I ask how much recycled aggregate costs per ton? I used it for the terrace, driveway, and outdoor areas. In some places, I even filled up to 60cm (24 inches). I can only recommend it! Officially, it is not classified as frost-resistant, but of course, all these values are calculated with a fine-toothed comb in the lab!

I would be cautious with suggestions like "just go ahead and do it" in situations like these. In most cases, there are quite strict requirements on how such things must be carried out. I would ask the structural engineer or architect for their opinion.

A tilting or settling foundation slab is definitely something you want to avoid. Losing a warranty claim because a standard was not followed is just as undesirable.

We filled our plot with recycled material, using about 800 tons in total, which saved us roughly 9,000 to 10,000 euros compared to using mineral concrete.

Recycled material also comes in different quality grades; I wouldn’t want to use just any kind of waste.

The foundation is constructed according to the soil report and the foundation recommendations included in it. This ensures the warranty chain.

We also used recycled concrete gravel, which saved a four-figure amount. However, a building permit / planning permission is required for this.

Stefan001 schrieb:

I would be cautious with a "just go ahead and do it" approach in such cases. Most of the time, there are strict requirements on how these things must be done. I would ask the structural engineer or architect for their opinion.
A floor slab that tilts or settles is, I believe, something you definitely want to avoid. Losing your warranty claim because you didn’t comply with a standard is just as undesirable.

Yes, everything should be clearly specified in the structural design.