ᐅ How deep should the foundation be for a slab-on-grade, according to Knecht?
Created on: 14 Oct 2022 19:32
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SaldierHello dear forum members,
I hope you can help us here.
We plan to build a KFW40 prefabricated house on a slab foundation from Knecht.
As part of the preliminary construction work, we would like to start the excavation. According to the soil report, neither a strip footing nor a frost skirt is necessary.
The soil report specifies a foundation depth of 80 cm (31.5 inches), while the selection protocol indicates a foundation depth of 90 cm (35.4 inches).
Are there any experiences on how deep the foundation usually needs to be for the slab foundation from Knecht?
I hope someone can share their experience and help us.
Thank you very much in advance.
I hope you can help us here.
We plan to build a KFW40 prefabricated house on a slab foundation from Knecht.
As part of the preliminary construction work, we would like to start the excavation. According to the soil report, neither a strip footing nor a frost skirt is necessary.
The soil report specifies a foundation depth of 80 cm (31.5 inches), while the selection protocol indicates a foundation depth of 90 cm (35.4 inches).
Are there any experiences on how deep the foundation usually needs to be for the slab foundation from Knecht?
I hope someone can share their experience and help us.
Thank you very much in advance.
Saldier schrieb:
I hope you can help us here.
We want to build a KFW40 prefab house on a slab foundation from Knecht.
As part of the preliminary construction measures, we would like to carry out the excavation work ourselves. I have already helped you – at least if you also read the threads from other people: I would not exclude the slab foundation from the scope of the house builder’s work. To be more precise, I advise not to separate the earthworks and the actual slab foundation construction in terms of contracts. A reputable house builder wants to manage the entire slab foundation trade “from the ground up” under their control.
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xMisterDx16 Oct 2022 17:04To be honest, I don’t see much potential for savings here. Simply excavating the pit and piling the soil nearby might save you about a thousand dollars, if anything at all.
You’ll need to arrange the excavator yourself, coordinate with the general contractor (GC) on where to place the pile, and in the end, you might face issues because it’s not done perfectly, meaning the groundworks contractor will have to redo parts of it, and so on.
AND:
It’s autumn. If anything gets delayed and your construction pit fills with water or the edges collapse, that will be your problem. When doing the work yourself, the GC expects a technically correct construction pit ready for them to install their compacted gravel layer.
You’ll need to arrange the excavator yourself, coordinate with the general contractor (GC) on where to place the pile, and in the end, you might face issues because it’s not done perfectly, meaning the groundworks contractor will have to redo parts of it, and so on.
AND:
It’s autumn. If anything gets delayed and your construction pit fills with water or the edges collapse, that will be your problem. When doing the work yourself, the GC expects a technically correct construction pit ready for them to install their compacted gravel layer.
Saldier schrieb:
According to the soil report, neither a strip foundation nor a frost protection footing is necessary.
The soil report specifies a foundation depth of 80cm (31.5 inches), while the selection protocol lists the foundation depth as 90cm (35.4 inches).
These statements don’t seem to align. If neither a strip foundation nor frost protection footing is required, what exactly is a foundation with a height of 0.8 m (31.5 inches)? How is the soil structure, and what type of foundation is planned?
Best regards
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