Footings
Switch the foundation on and every load bearing wall of the lowest storey gets a strip footing, mitred at the corners, and every structural column a pad. Place a pad on its own under a post, or type a size over what was derived.
Every property, and what it does
Select a footing and these are its rows: what it is under and its size first, then the building's own foundation numbers.
Footing
What the pad carries and how big it is.
| Field | What it does | Values |
|---|---|---|
| Under | The column or post the pad carries. | Read from the plan |
| Size, as derived | The size the foundation worked out for it. | Read from the load |
| Width | Typed to override what the foundation derived; cleared to derive again. | Millimetres |
| Length | Typed to override what the foundation derived; cleared to derive again. | Millimetres |
| Depth | How thick the pad is poured. Typed to override, cleared to derive again. | Millimetres |
| Drop | How far the top of the pad sits below the datum. Zero puts it directly under the pour. | Millimetres; default 0 |
| No footing | Leaves this column unfounded. Nothing is poured under it and nothing is billed for it. | On or off |
The building's own
The numbers the whole foundation is sized from.
| Field | What it does | Values |
|---|---|---|
| Soil bearing, assumed | The ground bearing pressure the footings are sized for. | kPa |
| Strip width | The width of the strip footings under the walls. | Millimetres |
How footings work
Switch the foundation on
In Settings, open Structure and turn the foundation on. Strips and pads are derived from the walls and columns.
Or place a pad
Open Foundation and choose Pad footing, or type PADFOOTING (PAD), and click under a post or a pier.
Override a size
Type a width, length or depth over what was derived; clear it to derive again.
See it in section
The footings sit below the ground floor's pour, so a section through the building shows the trench.
Footing questions, answered.
Do I draw every footing?
No. With the foundation on, strips are derived under the load bearing walls and pads under the structural columns. A pad placed by hand stands on its own.
How are footings sized?
From the load they carry and the assumed soil bearing pressure. Any size can be typed over and cleared to derive again.
Why can I not see them in 3D?
They are underground, below the ground floor's pour. A section shows the trench, and the X-ray and storey views look down into it.
Read on
- Columns: The columns the pads stand under.
- Wall Design: The walls the strips run under.
- Structure docs: Columns, beams, gridlines, braces and footings.