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Shoring versus underpinning
Short answer
Shoring provides temporary support to superstructure (walls, floors) using timber or steel rakers/props to prevent collapse during repairs. Underpinning permanently strengthens or deepens existing foundations using concrete, masonry, piles or grout to increase bearing capacity or reach firmer soil. Shoring is removed after use; underpinning becomes part of the permanent structure.
Differentiate between shoring and underpinning.
| Point | Shoring | Underpinning |
|---|---|---|
| Meaning | Temporary support to a wall or structure | Strengthening or deepening of existing foundation |
| Purpose | Prevent collapse of walls, floors or roofs | Increase bearing capacity, carry more load, or reach firmer soil |
| Work done on | Superstructure | Foundation |
| Materials | Timber or steel (rakers, props) | Concrete, masonry, piles, grout |
| Duration | Temporary, removed afterwards | Permanent |
| Types | Raking, flying, dead | Pit, pile, pretest, grouting |
✓ Answer checked by Claude Opus 5.5 (high effort)
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