MAXRaft® on TC2, Piles or Expansive Soils

MAXRaft 320 or 400mm is our solution for an insulated slab being built on less stable ground, in particular the TC2 type ground encountered in Christchurch or when moderately or highly expansive soils are encountered. 

The perimeter footings and load bearing thickenings from our MAXSlab® remain similar, ensuring that your perimeter and load bearing walls can be supported while maintaining the thermal envelope around the house.

The infill area of the slab is changed somewhat, engineered to provide stiffened ribs throughout the floor with the additional advantage of maintaining a thermal break around the foundation rather than transferring heat directly to the ground between the ribs where it is lost, as is the case with traditional waffle floors.

Each of these components combine to give you a foundation with an R value between 1.9 and 5.46 depending on the design. From November 2022 this design is adjusted to work in conjunction with Underfloor Heating where a minimum of R3 is required.  Check out MAXRaft Plus+

MAXRaft meets the requirements of Homestar V5 and is adjusted to meet the requirements of Passive House Certification. 


Product Features

• Suitable for TC2 ground
• Increased thermal efficiency
• Less time required on site
• Site-specific engineering
• Reliable, proven construction details
• Superior R-values

Engineering (PS1) for consent can be arranged through MAXRaft® or completed by any Chartered Structural Engineer.  We work with a group of engineers who are experienced in designing MAXRaft® foundations and can pre-empt council queries.