I will soon start building a basement, which will be about 45 square meters and will be backfilled from all sides. The big BUT is that I simply can't decide on which type of wall construction to apply. All the work will be performed by myself. I have access to my own machines (excavator/front loader), etc. I have looked at Jackon Thermomur. Concrete blocks with EPS & drainage board outside. Insulated blocks in Leca.
What I've concluded so far is that I'm leaning towards standard concrete blocks filled with concrete and then insulated from the outside with EPS to the desired insulation value.
Has anyone else been in the same considerations and has already built a basement who can share their experiences?
For my part, if I were to perform the work myself, the choice would be between regular lecablock and form blocks, both with a 200mm external drainage board. If there is high groundwater or for other reasons a lot of water in the ground, I would choose form blocks, otherwise leca. Lecablocks are slightly lighter and require less critical steps, such as when you have to fill form blocks with concrete. I would also draw a to-scale foundation detail and see how all the geometries (house/cellar) align with each other. From this, one can often draw conclusions about what would "fit" best.
There is a lot of water in the ground (right now but will of course be drained), but it feels like shell blocks become an incredibly strong construction. I'm thinking of casting in reinforcement in the correct place in the slab that goes up into the shell blocks so it becomes 100% fixed for ground pressure against the slab.
Thanks for the tip on the plinth!
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