A springing point is the starting point or zone where a structural element transitions into another element — for example, the location where an arch, vault or staircase begins to rise from a wall or support. The term is used in construction for the lowest part of an arch or vault, directly above the support.
Where does a springing point occur?
| Structure | What the springing point is |
|---|---|
| **Arch** | The point where the arch begins to curve from the wall or pillar |
| **Vault** | The line where the vault surface starts above the wall |
| **Staircase** | The bottom tread or the point where the staircase departs |
| **Chimney** | The location where the chimney begins on the floor or foundation |
Springing point in a brick arch
When building a brick arch, the springing point is crucial:
- Determine the springing height — at what height does the arch begin to curve?
- Place the springers — the first stones of the arch, often on a corbel or bracket
- Position the formwork — the timber formwork rests on the springing points on both sides
- Build the arch — from the springing point up to the highest point (the keystone)
Importance for the structure
The springing point is a load-bearing point: this is where the forces from the arch or vault are transferred to the wall or pillar. A properly executed springing point prevents:
- Cracks in the brickwork
- The arch sliding out
- Uneven loading on the supporting structure
Related terms
- Springer
- Vault
- Arch
- Keystone
- Pillar