Hello,
I have the following question:
I want to rebuild a basement floor. The room is intended to be used as an office later and will therefore be heated.
I made a hole to check the existing floor structure. I noticed that, starting from the height of the new floor, there is about 23 cm (9 inches) of foundation under the walls. Below that is sand. The foundation is also embedded in the sand.
Now the first question:
Am I allowed to remove the 23 cm (9 inches) in which the foundation is embedded? I understand that I absolutely cannot go deeper than those 23 cm (9 inches), but am I allowed to remove the 23 cm (9 inches) down to the depth where the foundation begins?
If yes, the new floor structure would start from there. If the new floor build-up is less than 23 cm (9 inches), I would simply leave some sand in place. That would then serve as the base for the new floor construction, meaning I wouldn’t have to remove as much material.
I also spoke with a screed installer who suggested the following build-up:
- 6 cm (2.4 inches) concrete screed
- 6–8 cm (2.4–3.1 inches) Styrodur (extruded polystyrene foam insulation)
- Vapor barrier (foil)
- Sand
Would this build-up be acceptable? Or should there first be gravel or something similar placed on top of the sand?
I would be very grateful for any answers.
Best regards
mat1984
I have the following question:
I want to rebuild a basement floor. The room is intended to be used as an office later and will therefore be heated.
I made a hole to check the existing floor structure. I noticed that, starting from the height of the new floor, there is about 23 cm (9 inches) of foundation under the walls. Below that is sand. The foundation is also embedded in the sand.
Now the first question:
Am I allowed to remove the 23 cm (9 inches) in which the foundation is embedded? I understand that I absolutely cannot go deeper than those 23 cm (9 inches), but am I allowed to remove the 23 cm (9 inches) down to the depth where the foundation begins?
If yes, the new floor structure would start from there. If the new floor build-up is less than 23 cm (9 inches), I would simply leave some sand in place. That would then serve as the base for the new floor construction, meaning I wouldn’t have to remove as much material.
I also spoke with a screed installer who suggested the following build-up:
- 6 cm (2.4 inches) concrete screed
- 6–8 cm (2.4–3.1 inches) Styrodur (extruded polystyrene foam insulation)
- Vapor barrier (foil)
- Sand
Would this build-up be acceptable? Or should there first be gravel or something similar placed on top of the sand?
I would be very grateful for any answers.
Best regards
mat1984
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