ᐅ Preparing the Site for a Concrete Slab on a Gentle Slope
Created on: 29 Aug 2023 16:09
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Peregrin T.
Hello everyone,
we are planning to purchase a plot of land with a slight (?) slope.
As shown in the attachment, the plot is between 24m and 37m deep and 16m wide. However, 3m of the plot’s width is restricted by a public easement for infrastructure, so no changes should be made in that area.
I have marked the possible building area and also a preferred floor plan (dashed line) on the plan.
What we are wondering now is how much effort it would take to build on this plot with a slab foundation, that is, without a basement. As you can see, within the preferred building area there is a height difference of up to 80cm (31.5 inches). In addition, there is a height difference of about 60cm (23.6 inches) from the edge of the desired house position to the easement area. The distance between the desired house position and the easement is approximately 1.6m (5.25 feet).
A soil report is currently in progress, but generally, clay soils are predominant in our region.
We are now wondering to what extent the plot is buildable as we envision it, and what measures might be necessary (e.g., supporting the ground towards the easement).
We are also willing to consult a specialist but are unsure who the right contact would be.
Best regards and thanks in advance
Perigrin
we are planning to purchase a plot of land with a slight (?) slope.
As shown in the attachment, the plot is between 24m and 37m deep and 16m wide. However, 3m of the plot’s width is restricted by a public easement for infrastructure, so no changes should be made in that area.
I have marked the possible building area and also a preferred floor plan (dashed line) on the plan.
What we are wondering now is how much effort it would take to build on this plot with a slab foundation, that is, without a basement. As you can see, within the preferred building area there is a height difference of up to 80cm (31.5 inches). In addition, there is a height difference of about 60cm (23.6 inches) from the edge of the desired house position to the easement area. The distance between the desired house position and the easement is approximately 1.6m (5.25 feet).
A soil report is currently in progress, but generally, clay soils are predominant in our region.
We are now wondering to what extent the plot is buildable as we envision it, and what measures might be necessary (e.g., supporting the ground towards the easement).
We are also willing to consult a specialist but are unsure who the right contact would be.
Best regards and thanks in advance
Perigrin
I would recommend waiting for the soil survey results. Generally, a foundation with frost protection is possible, which requires at least 80 cm (31 inches) of gravel. (If the soil allows, only remove the topsoil or bring it to the foundation level, then add gravel to the desired height. Avoid strip footings and frost skirts. If possible (permitted and available in frost protection quality), use recycled material to save some money.)
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Peregrin T.30 Aug 2023 09:01WilderSueden schrieb:
To me, the story sounds like a specific prefab home builder has already been chosen, which explains the preliminary selection. Now it’s just about picking the right house from the catalog and having it positioned by the draftsman in the building permit / planning permission application. That’s why they’re also talking about preparing the plot.
Sounds to me like expensive surprises are coming later. No worries, we have not committed to any manufacturer yet, nor to a floor plan.
We have visited several model homes and spoken with multiple manufacturers, and in some cases have already obtained (mostly) detailed quotes, hence the size and price information.
Now we want to ensure that the additional costs beyond the manufacturers’ offers will fit within our budget.
That’s why I initially asked what expenses to expect with this plot. For example, it might be possible to build narrower if that would significantly reduce the site preparation effort.
I understand you can’t answer such questions universally here; I just want to get a better idea of the costs and issues we might face. As mentioned, we are also happy to bring in a professional for the site preparation cost assessment, but we’re not exactly sure who the right contact would be (structural engineer / civil engineer / landscape architect / architect).
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WilderSueden30 Aug 2023 09:48For the planning phase, you need a good architect who considers the whole project as a unit. It’s a good idea to have a soil survey carried out early on. Based on the foundation recommendations and other requirements, you can then determine whether your space program is more cost-effective with or without a basement.
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hanghaus202330 Aug 2023 13:35Peregrin T. schrieb:
There is no development plan. The construction must be aligned with the neighboring buildings; we have already had a brief consultation with the city about this.Then you can share the outcome of that meeting with us.
Please show us an aerial photo of the neighborhood from the geoportal.
How have the neighbors addressed the issue of the slight slope?
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