Benefits for Builders

Installation benefits of MAXRaft®

MAXRaft® fully insulated concrete foundations provide a variety of benefits on site. The polystyrene insulation is designed to minimize waste onsite with pre-cut polystyrene that is installed like a jigsaw puzzle. Any leftover material is taken off site and recycled.

As a builder, you can choose to either install the slab yourself or engage one of our teams to supply and install the slab for you. This is one of the great benefits of MAXRaft products and being able to manager your own workload.

Ease of Install


The polystyrene for a MAXSlab® is delivered to site in pre-cut segments and will be installed just like a jigsaw puzzle - there are no ribs in a MAXSlab.

Pre-made corners make the installation of the MAXRaft edge profile fast and simple. The only cuts made on site will be those for underfloor drains which protrude through the foundation and for the straight MAXEdge perimeter insulation where required. Starting around the perimeter, where boxing outlines the outside foundation, the MAXEdge perimeter insulation can be laid up against the inside of the boxing. From here, the infill and load bearing thickenings can be placed using the perimeter as a base and the panel plan to specify which piece goes where. 

Steel and concrete are then installed as per the engineers specification.

MAXRaft® or MAXRaft Plus+

Similar to a MAXSlab®, MAXRaft and MAXRaft Plus+ are always fully insulated. For this product we use a POD layout, however we always have insulation right through all thickenings and ribs. The MAXEdge perimeter insulation is installed first and pre-made corners are installed to minimise waste. PODs are typically cut to size in the factory to avoid having to cut them to size onsite.

Any waste will be collected and recycled following the concrete pour.

Our products are simple and quick to install.  Typically we would allow 5 days to lay and pour a 200m² MAXRaft slab, allowing time for any inspections required.  Where underfloor heating is specified additional time may be required.


Just need perimeter insulation?  Look no further than MAX85, an easy way to achieve your minimum building code requirements.  MAXEdge insulation can be applied to any typical raft floor design.






Why MAXRaft®

Less Excavation

Excavation requirements are dependant on the ground conditions. Generally all our products are laid directly on top of the ground. 

MAXSlab excavation requirements tend to be minimal and on many sites it is a matter of a simple site scrape to remove topsoil. 


Site Preparation

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® insulation can be installed in a few hours.


MAXRaft slabs are protected following the concrete pour. Our recommended solution is a waterproof plaster system reinforced with mesh or you can request our pre-coated MAXEdge Insulation. MAXRaft can take care of the plastering requirements or you may choose to coordinate this yourself. Please contact us if you have any questions.


Testing and BRANZ Appraisal

We have been through the rigorous BRANZ appraisal process. Our processes and materials have been independently verified as meeting industry standards.

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