Foundations for SIPs (Structurally Insulated Panels).
Our Jackodur® Atlas SIPs foundation system provides a high-performance, fully insulated concrete slab base designed specifically for SIPs construction. This structural insulated foundation combines a reinforced concrete raftwith a high-density extruded polystyrene (XPS) layer, creating a continuous thermal envelope beneath your build. The result is a thermal bridge-free foundation solution, delivering U-values as low as 0.10 W/m²K, comfortably exceeding Passivhaus standards.
Unlike traditional strip or trench-fill foundations, this insulated concrete slab for SIPs buildings spreads the load evenly across the plot, making it suitable for a wide range of UK ground conditions, including soft or variable soils. Where necessary, the system can be engineered to integrate piles, ground screws, ring beams, or ground beams, providing a robust and adaptable solution for any SIPs project.
With its shallow excavation depth, the system reduces spoil removal, environmental impact, and overall build costs, while speeding up installation compared to conventional foundation methods.
Whether you’re constructing a SIPs home, extension, or Passivhaus build, the Jackodur® Atlas SIPs foundation provides the ideal base, delivering exceptional thermal efficiency, airtightness, and long-term energy savings from the ground up.
WE SUPPLY AND INSTALL
Net-Zero SIPs Foundations.
Build your SIPs home or extension on a truly sustainable foundation system. Our net-zero SIPs foundations are designed, supplied, and installed to deliver outstanding structural performance while dramatically reducing environmental impact.
We can work seamlessly with your appointed structural engineer or provide a full engineering design service through one of our trusted partners. All we require is a ground investigation report and loading calculations for your SIP panel structure, and our team will take care of the rest.
Working alongside national UK concrete suppliers, we use low-carbon concrete blends, recycled aggregates, and high-performance insulation panels to create a durable, airtight, and energy-efficient foundation. We measure, minimise, and offset all embodied carbon, ensuring your SIPs foundation is delivered as a true net-zero construction solution.
Get in touch today for a free, no-obligation quote and take the first step towards building a sustainable, high-performance SIPs home, starting with the perfect low-carbon insulated foundation system.
SIPs Foundation – Technical Detail Drawing
* example details for reference only.
- 1
Type 1 MOT – Compacted to 150mm depth
- 2
Sand Blinding – level to 50mm depth
- 3
XPS structural insulation panel – depth to U-Value requirements (circa 200mm)
- 4
DPM – 1200 gauge membrane
- 5
Reinforced concrete – depth to structural engineers specification (circa 250mm)
- 6
Screed – Finished floor levels to architects design
- 7
Expansion joint between screed and sole plate
- 8
Sole plate connection detail to structural engineers specification
- 9
Sole Plate
- 10SIPs (Structurally Insulated Panel) Structure
- 11
External breather membrane
- 12
External cladding details to architects design
- 13
External grade drainage board
- 14
External made up ground
Below Grade Structurally Insulating Panels.
300kPa
High Density
The foundation system is built on a below-grade, high-density, insulation panel specifically engineered to bear the weight of the structure. With an impressive compressive strength of 300–700 kPa, this closed-cell extruded polystyrene (XPS) is highly durable and moisture-resistant, maintaining its thermal performance even in damp ground conditions. Designed to withstand long-term structural loads without deformation, this specialist insulation creates a continuous, robust, and thermally efficient base, ensuring lasting stability and energy savings for your SIPs build.
INSTALLED FROM AS LITTLE AS £120 /m2
Bespoke to Your Design.
Each SIP foundation system is custom-cut and designed for your specific build, ensuring a precise fit with zero on-site waste. With lead times of around 4 weeks, this concrete raft for SIPs is engineered to suit your SIPs home or extension, factoring in plot size, perimeter detailing, concrete depth, and insulation thickness. Prices vary by project, but supply and installation for SIPs foundations in the UK can start from as little as £120 per m², offering a cost-effective, sustainable alternative to traditional strip or trench-fill foundations.
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Energy-Saving Foundations for SIPs.
Our SIPs foundation systems are designed to cut long-term heating costs from day one. The reinforced concrete slab delivers high thermal mass, storing heat during the day and releasing it slowly to maintain a comfortable, stable indoor temperature. Combined with the airtight seal of the concrete slab and a continuous layer of high-performance XPS insulation, this system minimises heat loss through the ground. The result is a home with exceptional thermal efficiency, achieving U-values as low as 0.10 W/m²K, exceeding even Passivhaus standards and providing lasting savings on energy bills for decades to come.
Get A Quote Today.
Get in touch today for a free, no obligation quote on your project. No matter what size, we consider all projects. Or, if you’d like to find out more about our products and services please do not hesitate to get in touch and a member of the team will respond as soon as possible.