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Structural Engineering

Suspended Slab Design

Suspended slabs sit above the ground and have no contact with the earth, yet provide the same feeling underfoot as a slab on ground. They can be deployed to create floors for upper stories, or used on top of supporting walls to form a ground floor (common on sloping sites). They offer better noise insulation between floors compared to timber and (of course) do not burn.

Our design process for suspended slabs involves:

  • Reviewing architectural plans
  • Drafting suspended slab layout
  • Engineering design and review — considering materials (e.g. metal sheet, tiles, cladding type), dimensional constraints, and other loading criteria
  • Design report from a registered professional engineer
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When is it required?

Suspended concrete slabs are often used for custom luxury homes. The added cost adds value by creating a solid underfoot feeling which some homeowners require. They are also commonly used on sloping blocks in garage areas to support the weight of vehicles. A special structural formwork, such as Bondek, is often used in this application.

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What's included?

The completed design report includes (where applicable) the following elements:

  • Layouts showing general arrangement and reinforcement layouts
  • Concrete specification
  • Slab thickness and steps
  • Reinforcement specification and concrete cover
  • Details and sections

Site specific design

With decades of soil testing and geotechnical experience, we design your foundations and structure to suit both the ground conditions and the surrounding areas.

Structural experts

With over 30 years’ design experience across thousands of Australian builds, we’re trusted by hundreds of builders across Australia.

Cost clarity

Our easy-to-follow reports lead the industry and will help you quickly get to the heart of costings and develop a building schedule for your suspended slab.

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One engineer for all your needs

Every building project is different, requiring a combination of engineering disciplines. From bottom to top, our engineers can work on soil testing and foundations, all the way up to frame and roof truss design and even inspections. We believe these shouldn’t be thought of as separate, unrelated services.

Whether you’re renovating, extending, building a brand new home, or putting in a pool, you can gain significant benefits from understanding (in advance) the full range of engineering services you might need — and from using the same engineer for all these services.
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Key advantages of integrated services

STA is a one-stop engineer with a service range that delivers three key advantages:

  • Save time and money

Pre-planning your engineering needs means you won’t have to keep re-booking an engineer when you need a particular service. It creates efficiencies that cut service times and save you money by pulling together the services you’ll need, at a lower overall price.

  • Enjoy engineering continuity

With all your engineering done by a single organisation, your consultants tap into a deeper knowledge of the site and the project, which leads to high quality outcomes, with more opportunities for innovative solutions.

  • Less risk, more reliability

While STA always takes legal responsibility for its engineering designs, an up-front engineering services package makes it easier to trust our work with a strong mutual commitment, and reduced risk of potential interruption or delay.

How it works

Engineering consideration – We help you think about your project in engineering terms. What specific services might you need?
Packaged plan – We develop a plan that packages up all the engineering services you need for your individual home or build project.
Prescheduled services – With each service pre-scheduled, we can work more closely with you over the life of the project.

Explore our engineering services

Whether you’re a builder, developer, architect or owner, STA has the size and range to cover every possibility, with a team of experts in every engineering specialty. Explore more specific info on:
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More on structural engineering

Our expert structural design engineers can design all structural components for your building project. You can count on our building structures team’s vast experience across multiple sectors and structures, including residential, light commercial, industrial, and modular building.
More about our structural engineering
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