Claylock +

Claylock is our unique, patented system of building new structures on clay based soils

Retroclay is our system of remediation of structural damage caused by clay based movement

Why Claylock and Retroclay?

  • Archicentre surveyed 75,000 Australian residential homes in Queensland in 2005 and found that a startling 38% were cracked

  • Foundation failure is the single largest source of insurance claims for civil engineering and a major source of litigation 

  • Repairs typically cost 30% of structure cost or can require the replacement of the entire structure in the worst case

  • Australians spend around $315 million per annum on reinforcement and foundation stiffening but cracking still occurs

Our Solutions


Accelerates the swelling of clay-based soils to their maximum during construction (shown above + right), then locks in the resulting levels prior to construction of the structure. This prevents cracking of the structure caused by the swelling and shrinking of clay under the foundations during the seasonal cycle.


Expands the footprint of the damaged structure (shown below), then stabilises the soil by irrigating underneath and raising the clay dome to its maximum capacity.  Repairs to the stabilised structure can then take place.

Click on the button to download an interactive animation for a comparison of soil movement and damage to structures built on :

  • Standard reinforced slab concrete footings and foundations

  • Stiffened concrete raft construction as per AS 2870

  • Claylock's patented foundational design       

[Please note : you may need to manually authorise this file depending on your firewall settings]

  • Elimination of cracking - no ongoing maintenance of property in problematic areas

  • Enables project construction in high soil movement areas (including H/H1 and H/H2 and some E grade under AS 2870)

  • Saves cost - up to $142 per square metre compared with stiffened raft construction

  • Saves time - works completed on time or ahead of schedule due to construction simplicity

  • Saves the environment – reducing concrete use, carbon emissions and harnessing the natural clay table movement to reinforce the structure

  • Saves structures - remediation of structures deemed uninhabitable or unsalvageable


2018 Case Study

Fully costed Traditional Pier Design vs. Claylock Design
423.6 square metre single level structure

Class H(1) Soils 


Schools :

Lumen Christi College Performing Arts Centre (above left); Guildford Primary School Library; Merredin Primary School;  Merredin Residential College; York District High School Performing Arts Building; Toodyay District High School Performing Arts Centre

Hospitals :

Moora District Health Facility (above right); Midland Nursing Home;

Residences :

Channybearup;  11 Chenin Lane, Ellenbrook;

Recreational and Aquatic Facilities :

Penrith Aquatic Centre; Kondinon Aquatic Centre; Northam Aquatic Centre; Caversham Community Centre

Successful Claylock projects



Successful Retroclay projects



Lukeis Residence -
Winner 1998 Association of Consulting Engineers Australia (ACEA) National Awards of Excellence -

Category 6 (Multidisciplinary - Geotechnical and Structural) + Category 10 (Other Fields of Engineering)

Made "uninhabitable" building saleable (before and after shots seen above)

Other projects include : 

Eastern Goldfield Regional Prison (35 buildings); Fairholme Hostel, Guildford; St Mary's Anglican Rectory, Guildford; Kondinon Hospital, Kondinin; Kununoppin Hospital, Kununoppin; Eastern Goldfields Regional Prison; Mukinbudin Nursing Post, Mukinbudin; Toodyay Post Office; dozens of private residences

Layering System

Another patented Advanced Substructures technique - using a two layer membrane with a high tensile upper layer and highly elasticised lower layer like a bandage provides additional crack remediation 

Successfully used in several projects such as Wimbledon Street, Beckenham (shown right)

Other technologies