Knowledge · Injection

Stabilising heritage buildings, churches and monuments without digging

Old buildings often stand on shallow brick or stone foundations, on ground that has changed over the centuries. Cracks in walls and vaults are then a sign that the ground under the foundation is weakening. With heritage, as little as possible should change. Injecting through small drill holes suits that well.

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Resin injection along the façade of a building, with lasers on the wall

Why inject at heritage buildings?

  • No digging along the old foundations
  • Small drill holes of 12 to 16 mm, barely visible
  • Continuous laser control: every millimetre is measured
  • No vibration, important for old masonry and vaults
  • The resin is light: about 85 kg/m³

Two techniques

Deep Lift (resin)Magnum Push Piers
WhenThe weak layer is shallow, down to about 3.5 mThe bearing layer is deeper
InterventionOnly small drill holesLocal excavation to about 1 m
ControlLaser per injection pointTest pressure per pier

First a survey

We start with a subsidence survey: crack pattern, level differences, crack gauges and soil data. For listed buildings we agree the approach with the architect and the heritage authority.

With serious damage, have a structural engineer assess the situation. Soiltek is a specialist contractor: we record, measure, propose a technique and carry out the repair, in consultation with your engineer.

What can we do?

Deep Lift

Expanding resin strengthens the ground under the foundation, without digging.

Slab Lift

Sunken concrete floors back to level.

Frequently asked questions

Is injection reversible?

The resin stays in the ground. That is why we discuss the approach for listed buildings beforehand with the architect and heritage authority.

Does the building have to close?

Usually not. We work through small drill holes and the injection unit stays outside.

How soon do you see a result?

The resin cures within minutes. The laser shows at once whether the foundation responds.

A project in mind?

Send us photos, a plan or the dimensions of the area. We reply within two working days.

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Read also: Strengthening the foundation before you renovate or build up · In which soils does resin injection work? · Is injection resin safe for the soil and groundwater?