A springer — also called an impost block or skewback — is the point where an arch or vault begins to rise from its support. At the springer, the construction transitions from vertical (the supporting pier or wall) to curved (the arch). The springer stone is the first stone of the arch and is cut at an angle to direct the load in the correct direction.
Springers in Different Arch Types
| Arch type | Springer |
|---|---|
| **Round arch** | Starts at the mid-height of the circle, perpendicular to the centre line |
| **Pointed arch** | Starts at impost level, slightly angled |
| **Segmental arch** | Springer sits outside the circle circumference — low, flat arch |
| **Vault** | The springer line runs all the way around the opening |
Components Around the Springer
- Springer stone (skewback) — the first wedge-shaped stone that starts the arch
- Impost — the flat bearing surface on which the arch rests (can be a lintel, string course, or pier cap)
- Springing point — where the arch leaves the wall or pier
- Buttress / pilaster — the wall thickening that resists the outward thrust
Springers in Renovation Projects
When restoring older houses or building arches in the garden, you encounter springers when:
- Repairing a brick arch above a door frame or gateway
- Building a decorative arch in a dividing wall
- Renovating a vaulted cellar
How to Build a Springer When Laying a Brick Arch Yourself
1. Determine the clear span — the width of the opening
2. Choose the arch form — round, segmental, or pointed
3. Calculate the springer position — where does the arch begin?
4. Build a centering (temporary wooden form) — shaped to the arch profile
5. Set the springer stone at an angle — the first brick is not vertical but angled toward the arch
6. Build the arch symmetrically — from both springers toward the center (keystone)
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