These case studies show the common problems we are asked to solve: bay window movement, inadequate existing foundations, ongoing subsidence and restricted-access underpinning. Each project is different, so the correct repair method depends on the building, ground conditions, engineer design and access.
StockportPiled underpinningBay window movement
Piled underpinning for bay window movement
A domestic property had movement around a bay window and cracking to the surrounding brickwork. The bay window had been formed on foundations that were not suitable for the load, while the main house foundations were performing differently.
The solution was to excavate locally, install driven piles below the affected section and connect the piles with reinforced steel and concrete so the load was carried to deeper, more reliable ground.
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ManchesterSubsidence repairExisting structure
Underpinning to prevent further subsidence
This type of project involves stabilising an existing structure where subsidence has caused visible cracking or movement. The aim of the works is to transfer the affected section of the building onto a stronger support system.
Depending on the engineer’s requirements, this may involve piled underpinning, needle beams, brackets, reinforced cages or a combination of local excavation and concrete works.
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SalfordFoundation repairBuilding control
Foundation repair after inadequate foundations were identified
On some projects, the problem is not long-term subsidence but existing foundations that are not deep enough, strong enough or suitable for the proposed construction above.
Where building control or a structural engineer identifies an issue, remedial underpinning or piled foundation repair can be used to strengthen the affected area and allow the project to move forward.
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Restricted accessScrew pilesEngineer-led
Screw pile underpinning where suitable
Screw pile underpinning can be useful on selected projects where a low-vibration, restricted-access option is required and the ground conditions are suitable.
It is not suitable for every site. The final method should be chosen after reviewing the loads, access, ground conditions, obstructions and the structural engineer’s design requirements.
Read about screw pile underpinning