Choosing a concrete sleeper finish is a visible decision in a retaining wall. Retain The Earth offers Portland Grey and Blackwater Charcoal finishes in its current concrete sleeper range. This guide puts the two choices beside the dimensions you need to check before ordering.
The two finishes
Portland Grey gives a lighter concrete appearance. It can sit comfortably with pale paving, gravel and rendered surfaces. Blackwater Charcoal is the darker option and can make the wall a stronger visual element beside planting or dark fencing. Colour is a design choice; confirm the actual appearance with a current product photo or sample before ordering, especially if it must match another material.
Sizes in the current range
Both finishes are listed on the current technical specifications page. The concrete sleeper dimensions shown there are 2000 × 200 × 80 mm, 2000 × 200 × 100 mm, 2350 × 200 × 80 mm, 2350 × 200 × 100 mm, 2400 × 200 × 80 mm and 2400 × 200 × 100 mm. Dimensions are length × height × thickness. Retain The Earth lists reinforced 60 MPa concrete manufactured to AS 3600.
Choose the length and thickness from your wall design and the applicable engineering details, rather than selecting them by colour alone. Confirm the post spacing, required wall height, ground conditions, drainage and the design of any corners or steps with the person responsible for the installation. If your project needs engineering approval, use the project-specific requirements.
How to decide between grey and charcoal
Compare them at the site. Put the finish beside the fence, paving and other landscape materials that will remain. A close-up product image and a completed wall photo answer different questions: one shows surface detail; the other shows how a full run reads in context.
Check the quantity by length. Measure each straight run and note corners, changes in height and any openings. Give those measurements and the engineering specification to the supplier so the order can be checked against the chosen sleeper length and thickness.
Ask about the current batch. Concrete appearance can vary between photographs, lighting and production batches. Confirm finish and availability when requesting a quote. Do not assume that grey and charcoal have different structural ratings; the published technical page describes the sleeper range as 60 MPa reinforced concrete.
Get the current data before ordering
Use Retain The Earth’s technical data and specifications page for the current size list and downloadable sleeper data sheet. For a quote, tell the team the finish, required dimensions, quantity, delivery location and any project drawings. Contact Retain The Earth to discuss the order.
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