Walkout Basement
I'm looking for a best practice/work flow approach to determining the cut and fill volumes for a building foundation and associated grading.
I'm building a a home on a parcel that slopes from the front to the back of a lot at a skew. The foundation will have a walk out on the backside (downhill side) of the foundation so the grading (dirt elevation) against the foundation will vary from front to back.
I created a tin of the existing topo of the surface and a feature line that outlines the footprint of the top of the foundation (equal elevation at all corners of foundation/feature line). I can create the grading plan off of this, however, it assumes that I'm grading to the equal elevations to the top (or near the top) of on the foundation...which isn't true because the lot naturally slopes to the back and it will be a walkout foundation.
I can edit the elevations of the corners of the foundation/feature line to identify the elevation of the grading elevation (dirt) at the foundation around the house (for instance, at the front of the house, I can set the dirt grade at 6 inches below the top of foundation and calculate what the dirt grade would be against the foundation at all corners leading down to the walkout elevation at the back of the house). When I do this, I'm only developing the grading plan for the grading (and I assume that C3D will calc the cut and fills from this) but it doesn't include the cut and fill for the full depth footprint for the foundation. This is the crux of my post and the following question.
What is the work flow/best practices to address this problem and to have C3D calculate the cut/fill of both the grading plan and full depth foundation/s? I will also need to add the garage slab that isn't full depth but will need frost footings down to 4 feet.
Comments
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Hello.
Regarding using the civil survey tools in Bricscad
- When creating a grading, this entity has some volume properties which are displayed in the Properties panel when the entity is selected.
- Specifically, there is the Grading statistics category in the Properties panel.
This category contains the Fill, Cut, and Net volumes. - Another solution to calculate volumes, depending on the design intent, could be to use the TINVOLUME command.
Regarding using C3D
I don't have a copy of it and can't test the procedure.
Maybe, addressing the same question on a C3D forum could be helpful.
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This type of basement is partially aboveg round and typically built on a sloped lot, allowing for at least one full-size door and windows.Unlike traditional below-grade basements, this type of layout allows for natural light, fresh air, and easy outdoor access, spacebar clicker making it feel more like an extension of the main living space. Depending on your needs, it can serve as a private rental suite, home office, gym, or guest room.However, because they usually have a concrete slab foundation and some earth-protected walls, they provide a good location for construction of an in-residence shelter.
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Making a surface model can be tricky. One project i worked on had 12 surface edits as it was a large landscaping project with cut and fill all over the place. Did one edit at a time saving a new surface, so all edits were in sequence with final surface used for volumes.
I would start with surface 2 a subtraction of a cube from your existing surface. Then surface 3 has the edge and internal beams subtracted from surface 2, You may need to grade with like a very small vertical edge batter, say 5mm, if you don't do this the surface will join top and bottom 3d points when making a new TIN.
Think also about wether you have aggi drains around edge so out side excavation is a bit wider to cater for the sub surface drain.
Its almost a 3d solid solution.
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