MAXRaft® fully insulated foundations provide a variety of benefits on site. Pre-cut slabs delivered to site mean less time is needed to lay a slab, and less waste and litter to clean up once it has been laid. With slabs labelled in accordance with our panelplan, putting the MAXRaft® insulation together is as simple as putting together a jigsaw.


Installation Benefits of MAXRaft®

Ease of install

As MAXRaft® is delivered to site in pre-cut slabs, there is minimal time spent cutting the slabs to meet site requirements. The only cuts made on site will be those for underfloor drains which protrude through the foundation. Starting around the perimeter, where boxing outlines the outside foundation, the perimeter footings can be laid right up to the boxing. From here, the infill and load bearing thickenings can be placed using the perimeter as a base and the panelplan to specify which slab goes where.

Reduced Labour / Quickness of install

Typically, a 180m2 house would require a team of two approximately 2.5 hours to lay the MAXRaft® insulation, provided the site has been set up correctly.

Once the MAXRaft® insulation has been laid, work can start on laying the reinforcing immediately. In some cases, the laying of reinforcing for one half of the house has started while the MAXRaft® for the other half of the house is still being put down.

Reduced Concrete

With 150mm MAXRaft® insulation through the center of the house, concrete requirements are lower than for traditional slabs. As such, the concrete can often be poured as single pour, and the reduced volume requirements mean that pour is quicker.


Recent on site testing on the use of screw in bolts with the MAXRaft® system have proven that both M10 and M12 Ankascrew screw in bolts meet the 15kN tensile strength threshold required under NZS3604 (click here for results). We will shortly be undertaking further testing under the BRANZ EM1 test to include shear testing also.

Ramset testing has also been done on M10 Grade 5.8 Chemset Studs (the results of which can be found here and on our downloads page.

Preparation Benefits of MAXRaft®


Generally, MAXRaft® can be laid without the need for trenching. For sites of 100kPa and greater, our standard MAXRaft® can be laid directly on top of the ground. For sites of 60kPa and greater, our MAXWaffleRaft can be laid in the same manner. In the rare cases where trenching is required (such as in frost heave regions or on sites with very poor soil), it tends to be needed only around the perimeter.

Less excavation

As MAXRaft® can be laid directly on top of the ground, excavation requirements tend to be minimal, on many sites it is a matter of a simple site scrape to remove topsoil. The ability to lay MAXRaft® without the need for traditional excavation both speeds up the process and reduces the need for increased labour.



Site preparation is quick and easy. Once the ground has been levelled and compacted in line with the Geotech report minimal bracing is required. Simply put up boxing around the perimeter and lay the polythene underlayer to 100mm outside the foundation and the MAXRaft® can be overlaid in a morning.


There are several ways to protect the MAXRaft® exterior from the elements. While traditional methods like plastering the outside or covering it with Protecto tape, we have found that a Supercoat™ exterior works very well. A breathable, waterproof membrane, it lets moisture seep out from the inside, but prevents the same moisture entering from the outside. With an ability to tank to the polythene underlayer, it can provide complete waterproofing around the exterior of the MAXRaft®.

Testing and Code Approvals

We have been through the rigorous CodeMark process and obtained the CodeMark accreditation. Our processes and materials have been independently verified as meeting industry standards.