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Price range: £28.95 through £30.50 ex. VAT
Underpinning jacks are a proven solution for contractors and builders tackling foundation subsidence and structural settlement. Designed to stabilise and support structures during underpinning works, these adjustable jacks are suitable for both temporary support and permanent reinforcement.
Available in sizes 1, 2, and 3, each jack is manufactured from durable steel with a natural self-finish for strength and longevity. They are specifically engineered for seamless integration into concrete pours, allowing them to become part of the finished structure without compromising performance.
Ideal for residential, commercial, and industrial applications, our underpinning jacks provide the robustness and adjustability required for critical support work. Review the specifications below to choose the correct size for your project and see why professionals trust these jacks for reliable foundation stabilisation.
Built for safety, precision, and long-term performance, our Size 1, 2, and 3 underpinning jacks deliver dependable support where it matters most.
Choosing our underpinning jacks means choosing proven reliability and safer project outcomes. Get in touch today for bulk pricing or expert guidance on selecting the right size for your build. For broader shoring and propping needs, we also sell adjustable Acrow props (Sizes 0–4, versatile heights up to 4.87m) and Strongboy prop heads for enhanced wall and lintel support during openings or alterations.
Our underpinning jacks come equipped with standardised features across all sizes, including 200mm x 200mm x 6mm base and head plates for optimal load distribution. Below, you’ll find a comparison table highlighting the key differences between sizes 1, 2, and 3, followed by additional technical details.
Size | Closed Height (mm) | Open Height (mm) | Adjustment Range (mm) | Approximate Weight (kg) | Safe Working Load (Tonnes) |
1 | 300 | 450 | 150 | 5 | 6 |
2 | 400 | 600 | 200 | 6 | 6 |
3 | 500 | 700 | 200 | 7 | 6 |
This table makes it easy to select the correct jack based on your project’s height requirements, size 1 for tighter spaces, size 3 for greater extensions.
Don’t settle for subpar supports; elevate your work with jacks that deliver. Order now and experience the difference in stability and peace of mind.
Applications and Installation Guide
Underpinning jacks are essential in scenarios where foundations need bolstering, such as in older buildings showing cracks or during extensions that require load redistribution. Common uses include:
Quick Installation Tips:
Following these steps maximises safety and effectiveness, drawing from best practices in construction engineering.
Underpinning jacks, or foundation supports, are adjustable devices that prop up subsiding structures, providing stability during repairs or reinforcements to prevent further damage.
Select based on required height: Size 1 (300-450mm) for compact areas, Size 2 (400-600mm) for medium extensions, and Size 3 (500-700mm) for taller supports. All share the same 6-tonne SWL.
Yes, they are engineered for both temporary propping (e.g., during excavation or repairs) and permanent embedding in concrete pours for long-term foundation support. The self-coloured steel finish and robust construction make them ideal for leaving in place without corrosion issues when properly concreted around.
While straightforward, we recommend professional installation or engineer oversight to ensure proper load assessment and safety compliance.
Minimal inspect for damage before use, clean after exposure to elements, and store in a dry place. The self-colour finish naturally protects against rust.
These jacks meet typical UK/EU construction standards for adjustable props and supports (similar to EN standards for shoring equipment), with full traceability via marked plates. Always follow HSE guidelines for temporary works, ensure competent persons install/adjust them, and never use damaged units. For critical projects, provide certification documentation to site inspectors.
Select the size with the appropriate range first (e.g., Size 3 for up to 700mm open). For greater extensions, use additional packing plates (steel shims) under or on top of the base. Avoid unsafe stacking or over-extending beyond design limits.
Yes, they’re built for multiple uses. Inspect for any deformation, thread damage, or corrosion after each job. Clean thoroughly, lubricate threads if necessary, and store dry. Reusable nature makes them cost-effective for contractors handling repeated underpinning or shoring work.
Use load-spreading plates or pads under the base and top, if needed, and position the jacks symmetrically under the load-bearing points. Monitor with a spirit level or laser during adjustment and consult load calculations from a structural engineer for multi-jack setups to avoid point-loading or twisting.
They perform reliably in most stable ground conditions when properly placed on a firm, level base (e.g., concrete pads or compacted hardcore). However, in very soft, waterlogged, or highly unstable soils, additional base preparation or engineering assessment is essential to prevent settlement under load. Always have a structural engineer evaluate site-specific conditions.
Our jacks are designed with a conservative safety factor (typically 2:1 or higher, in line with industry standards for similar adjustable steel supports). The 6-tonne safe working load accounts for dynamic and static loads in underpinning applications. Never exceed this rating, and factor in a margin for uneven loading or site variables.
| Size | Size 1, Size 2, Size 3 |
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