Frequently Asked Questions

What is MAXSlab®?

A thermally broken slab that is also fully insulated; the only one of its kind on the market. A MAXSlab slab achieves r-values 3x the Australian building code and will improve the performanceof your home from the foundation up.  

Who provides the Engineering design?

As a part of our package, MAXSlab has it's own fully qualified engineers who can provide a site specific engineering design. Alternatively if you would like to use your own engineer then we can work in with you to ensure a smooth design process. 

Why should I choose MAXSlab®?

You can change your windows, you can replace your carpet, you can buy a new kitchen...

You can't change your foundation.

MAXSlab® is a great choice for any home.  MAXSlab® acts as the thermostat for your home which means the temperature does't' fluctuate as much as other floors. This constant temperature reduces the susceptibility of your home to mould growth and assists in providing a warm and healthy living environment.

How is MAXSlab® installed?

MAXSlab® has a comprehensive Onsite Guide and with guidance from the MAXSlab® team any full trained builder can install a MAXSlab system.   

How do I coat the outside of the MAXSlab®?

There are a few different options for coating the outside edge of MAXSlab® from a Hard Edge to a Plaster finish. Please see our Protecting MAXRaft® page.

What sets MAXSlab® apart?

Warmer, healthier and more energy efficient homes.

Increased thermal efficiency & higher R-values., Less time on site, Site specific engineering, Reliable proven construction details.

What is the width of the MAXRaft perimeter insulation?

The standard MAXSlab detail shows a taper that goes from 50mm to 20mm at the top.  This detail is used when MAXSlab is constructed with 90mm frame.  For frames that are 140mm+ we can remove the taper altogether to give you additional insulation.

How do I order a MAXSlab® foundation?

Simply email a full set of your plans along with a Geotech report (if applicable) to  We can produce a quote for you within 1 business day.  Following acceptance of the quote and consent being issues we generally require 3 weeks notice.

How environmentally friendly is MAXSlab®?

Known for its highly efficient insulating properties, Expanded Polystyrene (EPS) has long been a leading choice in the industry for energy efficient homes.  The waste produced in the MAXSlab® production process is recycled and eventually turned into new EPS insulation.

How long does installation take?

For a standard 200m² house on good ground we would allow approximate 5 days to start and pour the slab. 

If we already have consent for a standard slab can we change to a MAXSlab®?

Yes, we will supply an engineered foundation package and you will simply have to fill out a variation to your building consent.

Can MAXSlab® be used in conjunction with underfloor heating?

Yes, they are a perfect match. Because the MAXSlab® is fully insulated underfloor heating works extremely well as it will prevent heat loss around the perimeter of the slab.  We have seen efficiencies of 30 – 40%. 

What is the R Value of a MAXSlab®?

Because all floors are different the R value varies but a typical MAXSlab® foundation has an R-value of approximately R4. Try our calculator here (opens in MS Excel).

How does MAXSlab® perform with a polished floor?

Excellent. Because the MAXSlab® isn’t tied to ground, the concrete will shrink when curing resulting in a stronger slab.  You can never guarantee a slab will not crack, however please ask us for tips on how you can minimise the risk.