MAXRaft - <100kPa, TC2, Piles or expansive soil

MAXRaft 320/400mm 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. MAXRaft is engineered to be seismically stronger in earthquake conditions compared to traditional concrete foundations. 

The perimeter footings and load bearing thickenings from our standard MAXRaft® 250mm 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 of ~R4.5 depending on the nature of the site. Click here to try our H1 calculator to see what R-value your home could obtain (opens in MS Excel, see 2nd tab).

Product Features:

  • Suitable for TC2 ground
  • Increased thermal efficiency
  • Less time required on site
  • Site-specific engineering
  • Reliable, proven construction details
  • Achieves an R Value of ~R4.5 and above according to floor type. 

Engineering

Engineering (PS1) for consent can be arranged through MAXRaft®, we work with a group of engineers who are experienced in designing MAXRaft® foundations and can pre-empt council queries.

Local authorities may request a PS4 for engineering sign off, any local engineer can inspect the MAXRaft®.

Designs

Below is our standard design, as each site is engineered on a site specific basis we are unable to provide additional engineering details with this design at this point. If you are interested in our system please contact our team on 0800 MAXRAFT (629 723) or info@maxraft.co.nz to discuss.

MAXWaffleRaft - Timber Frame with Lightweight Cladding - PDF

MAXWaffleRaft - Timber Frame with Lightweight Cladding - .dwg