How to Anchor and Secure a Dome Shelter on Different Surfaces (Concrete, Gravel, Dirt & More)

A dome shelter is only as strong as what’s holding it down. Get the anchoring wrong, and even the best-engineered structure can shift, lift, or fail in a serious wind event. Your anchoring method needs to match both your ground surface and the wind ratings Australia uses to classify your site under AS/NZS 1170.2:2021.

Here’s exactly how to anchor a shed with and without concrete (including gravel, dirt, and asphalt surfaces) and why container mounting is changing the game for farms, mines, and worksites that need to move.

Quick Answer

• Concrete slab: Use chemical or wedge anchors drilled into a properly poured pad (the strongest, most permanent option).
• Gravel or dirt: Use helical (auger) ground anchors. Skip rebar spikes if wind ratings are a concern.
• Asphalt: Use asphalt-specific spike anchors, never concrete wedge anchors.
• Shipping containers: Use a twistlock bracket system that locks into ISO corner castings.
• Always match your anchor design to the wind region of your site, as specified in AS/NZS 1170.2:2021. The standard divides Australia into Regions A0 to D, with cyclonic Region D requiring engineering for design wind speeds well above 80 m/s.

Why Surface Choice Drives Wind Ratings in Australia

Every dome shelter sold in Australia should be engineered in accordance with AS/NZS 1170.2:2021, the standard referenced by the National Construction Code for wind actions on structures. Your wind region, terrain category, and shielding all feed into the design pressures the anchors have to resist.

The catch? The strongest dome frame in the country won’t hold its certified rating if the anchors underneath it can’t transfer those uplift loads into the ground. That’s why surface and anchor selection are part of the engineering, not an afterthought.

For a region-by-region breakdown, see our guide to dome shelter climate and wind considerations.

Anchoring on Concrete

Concrete is the gold standard. A poured slab (typically with a minimum thickness of 150 mm and reinforcement) provides a flat, stable, permanent footing.

Use mechanical wedge anchors or chemical (epoxy) anchors drilled into the slab through pre-formed holes in the base rail. Edge distance is important – install too close to the slab edge, and the concrete can blow out under load.

Best for: Permanent installations, workshops, processing sheds, anywhere you need maximum certified wind ratings in Australia’s higher-risk regions.

Anchoring on Gravel and Dirt

If you’re wondering how to anchor a shed without concrete, helical ground anchors are the answer. These are the same auger-style anchors used on mobile homes, which are screwed deep into the soil to provide uplift resistance.

Standard rebar spikes are common but a poor choice for serious wind ratings. Helical anchors, by contrast, can be certified for engineered wind loads.

Use helical/auger anchors typically 900 mm or longer, sized to your soil density and wind region. A geotechnical assessment is worth doing on softer soils.

Best for: Farms, paddocks, laydown yards, and any site where pouring concrete isn’t practical.

Anchoring on Asphalt

Asphalt looks solid, but it’s softer than concrete and behaves differently under load. Concrete wedge anchors will pull straight out, so you need asphalt-rated spike anchors that drive through the surface and into the soil beneath.

Best for: Existing hardstands on logistics yards, depots, and council-owned sites where re-pouring isn’t an option.