Complete Insulated Raft Foundation Solutions

We provide a collaborative approach to create the most complete range of insulated raft foundation solutions, using the best materials.

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The GreenRaft Advantages

  • Highest Thermal Performance
  • Collaborative Design Solution Development
  • Best Quality Materials
  • Highly Cost Effective
  • Most Accurate Construction Of Any Insulated Raft
  • All Materials Held In Stock
  • Waterproof Insulation
  • Multiple Solutions For All Applications
  • Greenest Concrete Offering
  • Simple Construction Techniques


Your insulated raft foundation design will depend upon soil type, ground level, floor level, type of structure, thermal design, and the choice of external cladding. We work with the architect and structural engineer to get the right design for your individual project with our infinitely adaptable system.

Plain Raft

This is the basic insulated raft foundation. A base layer of high density XPS insulation supports the load bearing concrete slab and a rigid XPS edge insulation creates the thermal envelope.

To get an idea of costings go to our U-value and Cost Calculator page.

Raft With Upstand

Adding an upstand to the insulated raft foundation allows for timber frame or SIPS panels to be raised to a minimum of 150mm above ground level.

Raft With Upstand & Brick Support

An insulated raft foundation that has to support a brick or stone veneer needs a special solution with a ring beam upstand and a step in the outer layer. A separate ring beam is frowned upon by major warranty providers.

Any other Insulated Foundation

The GreenRaft system is fully adaptable and can be used in all foundation applications. We work collaboratively with construction professionals to provide high performance solutions for a wide range of projects from basements to refrigerated warehouses.

Professional And Reliable Service For an Insulated Raft Foundation That You Can Trust

Fully Certified


Top Quality

Faster Delivery
Faster Build

Satisfied Customers

“GreenRaft was an excellent choice for us. It went together perfectly and allowed us to get almost perfect placement. We were within 1mm on all dimensions and our laser level showed we were absolutely spot on with 7 out of 8 corners.”

Mr S. T

“I have been a concrete contractor for over 30 years, and have a fair experience of insulated concrete raft foundations. This product is very impressive in all respects. It is beautifully simple and well thought out and goes together so quickly and accurately.”

Lenny Q
Building Contractor

“The GreenRaft system allows the design of a wide variety of foundation edge details to sort all soils and construction types. It is very well designed and the upstand detail is perfect for timber frame and SIPS companies to build from.”

Tim S
Structural Engineer

“From the initial design to the installation the people at Green Raft have been very helpful.The tech people were a great help in sizing the insulation and getting the details underway. I am now looking forward to doing one with cellular glass insulation.”

Emma P

Our Projects

Fully Insured & Warrantied

All our insulations carry full product certifications and are accepted by the major warranty and mortgage providers.