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A 2022 full-scale experiment found that a specific wall built from end-of-life tires filled with compacted soil could function as a structural member under the loads researchers tested. It does not prove that tire walls are universally as strong as concrete, or that any tire-wall design is safe without project-specific engineering and local approval.
What the study tested
The study, “Experimental study on the structural performance of full-scale tyre wall for residential housing applications,” was published in Engineering Structures in 2022. The researchers assembled end-of-life tyres filled with compacted soil course by course in a staggered arrangement, creating tyre-encased-soil elements. They applied axial load to simulate roof loading, followed by gradually increasing cyclic out-of-plane load at the wall’s mid-height. The paper reports a linear-elastic vertical compressive load–displacement response and an inelastic out-of-plane response. The latter ended in joint rotation and opening at mid-height.
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The University of South Australia reported that one real-world wall was tested. PhD candidate Yachong Xu also developed software models to extrapolate the test data to other designs. That combination is experimental evidence plus modeled extrapolation—not field validation of every configuration, construction method, or climate. The university’s 2022 release describes the test and modeling.
What “as structurally sound as concrete” means
Study authors concluded that tyre walls can be used as structural members in residential housing. Co-author Dr Martin Freney characterized the tested wall as structurally sound compared with conventional residential walls and said it was resilient, able to “bounce back into shape” after impact. These are researcher-attributed descriptions of the tested wall and analysis, not a finding that all earth-packed tire walls are interchangeable with concrete.
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Freney said: “The wall we tested was the first of its kind to be scientifically tested in this fashion, and all the data indicates tyre walls can be extremely strong and safe structures.” The university release attributes the statement to him.
How to compare a tire wall with concrete or wood sleepers
A useful comparison starts with the conditions and outcomes actually discussed, rather than treating “strength” as a single universal property.
| Comparison | What the study and university release support |
|---|---|
| Vertical and out-of-plane loading | The tested wall had a linear-elastic response to vertical compression and an inelastic response to cyclic out-of-plane loading, with joint rotation and opening at mid-height at failure. These results apply to the test wall and setup. Study |
| Deformation and impact | Freney described tyre walls as resilient and able to recover shape after impact; this is a researcher’s characterization, not a universal quantified comparison with concrete. University release |
| Drainage and fill | Freney said recycled concrete rubble or crushed bricks used as drainage material in tire fill could offer benefits in retaining-wall contexts. The release presents this as a potential benefit, not a measured finding for every fill choice. University release |
| Design and failure behavior | The observed out-of-plane failure involved joint movement and opening, so behavior needs analysis for the specific wall rather than assumption from the material alone. Study |
| Code acceptance and approvals | The study abstract said certified design guidelines or code provisions for tyre-wall systems were unavailable when it was published. Current approval requirements depend on jurisdiction and are not established by that statement. Study |
What the results do not establish
- They do not establish that every earth-packed tire wall has the tested wall’s structural performance.
- They do not establish that a retaining wall and a residential structural wall face the same design requirements or loads.
- They do not show that copying a generalized Earthship description or another tire-wall design will produce a safe structure.
- They do not confirm present-day code acceptance or approval in any particular location.
Anyone considering a residential or retaining-wall project needs a project-specific structural assessment and confirmation of local requirements. The study supports the possibility of structural use; it does not replace design review.
Why the idea attracts attention
The University of South Australia’s 2022 release reported that Australia generated an average of 55 million end-of-life tyres—450,000 tonnes—annually. That is the release’s reported average, not a current independently updated figure. University of South Australia, 2022
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