We used one on our last demonstration home builds, here you can see a time lapse DIY raft slab / slab on grade installation video. It’s not always easy to find an independent engineer that will design a raft slab, so I would suggest you contact legalett that provides slab on grade prefab kits across Canada and the US. From there you would build up with your ICF walls and then backfill it and you’re done. So what you may be able to do, is dig out the portion of the hill that would be the back wall, create a level flat surface that big enough for the footprint of the building, and lay the slab on it.
Raft floating foundation how to#
Raft Slabs – how to build a slab on grade or basement on problem soilsĪ raft slab is engineered to spread the weight of the building evenly over the entire surface of the slab, so there is no footings needed, and no, its not going to go anywhere when done properly, and a perimeter skirt insulation is added to prevent frost heave.
At those places, we use mat foundations to distribute the whole loads of the structure to the earth (When the footing area increases, then the soil load-bearing capacity will also increase) because this foundation reduces the stress on the soil at the same place. But I think building the slab on grade would be more simple than you think, you can read more here if you haven’t already found this page- Raft/Mat foundation is used in those places where we have less bearing capacity of the soil. We would strongly advise against building a house out of old tires at any age! I think you are very much on the right path with a raft slab / slab on grade shallow foundation and and ICF block wall.
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