"H" Composite Posts

HYBUILT's H composite posts are the intermediate posts in a lightweight retaining wall. Sleepers span between them and the posts carry that load into the pier, the same as a steel wall, but at around a tenth of the weight. That is the whole point of the composite range: one person can carry and place them, so they suit tight blocks, backyard access and any job where a crane truck cannot get near the wall line.

Rated for walls up to 1 metre high. Above that you are generally into engineered territory and galvanised steel posts. Use C composite posts at the ends and H posts through the middle, matched to our composite sleepers.

Specifications

Lengths and weights

For comparison, the equivalent 2.0m galvanised steel H post weighs 29.6kg. The composite is 7kg. On a wall with twenty posts that is the difference between a machine and a wheelbarrow.

Working out the length you need

As a rule of thumb the post is twice the wall height, because the recommended pier depth matches the height of the wall. A 1.0m wall, the maximum for this range, therefore takes a 2.0m post. Use the wall calculator to size and count them, and see the wall height guide for where composite stops and steel starts.

Walls over about 1 metre high commonly need council approval and an engineered design, and approval can also be triggered by loads behind the wall, a slope above it, or the wall sitting close to a building, a boundary or another wall. Thresholds vary by council across South East Queensland and Northern NSW, so confirm what applies to your site with your local council or a building certifier before you order.

Finishing the wall

Run composite capping along the top sleeper for a clean square edge, and use the composite support as a footing for your bottom sleeper to keep it stable during install. Composite wedges pack out the gap between sleeper and post so every course sits level.

Questions about your project? See our installation guides, request a quote, or call (07) 3716 0191.