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Structural Engineering

Sub Floor Columns & Bracing Structural Design

Sub floor columns (stumps) support the house off the ground and help to provide a level platform when building on a slope. As a result, bracing must be designed to ensure there is no sway with general foot traffic, or from other natural forces such as wind.

Typically, you will see cross bracing made with steel rods fixed to the columns in a ‘x’ pattern. Tie-downs keep the footings, stumps and structure above from lifting and separating.

Our sub floor structural design process involves:

  • Reviewing architectural plans and project information
  • Drafting sub floor column layout
  • Engineered design of sub-floor, taking into account loads and materials (e.g. steel columns, cross-bracing)
  • A design report approved by a registered professional engineer
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When is it required?

Also known as stumps, sub floor columns are used to elevate the house to provide a level floor — most commonly when building on sloping blocks. Stumps are often seen with decks as well as under the main floor space. If building in a flood prone area, it is also a requirement to raise the floor level of a dwelling above the designated flood level. A suitable sub floor column and bracing design is critical to ensuring structural adequacy in these situations.

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What's included?

A PDF report is compiled and signed by a registered professional engineer. The design details include (where applicable) the following elements:

  • Required bracing resistances
  • Column sizing and locations
  • Bracing specification and locations
  • Tie-down specification to footing/slab and structure above

Site specific design

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

Regional soil profiles

With data across hundreds of thousands of soil tests, we’ve developed regional profiles of soil compositions, along with wind ratings and other ‘site estate specific’ data. This means we can understand an estate as a whole rather than a single site.

Clear communication

From order placement through to job completion, STA makes it easy for you to track the status of your project.

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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.

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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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