Allan Block®
Whether you’re after strong lines or graceful curves and steps, you can create the look with Allan Block® Junior. This retaining wall system comes in a choice of two natural stone-look colours: Rock Salt and Southern Boulder.
Allan Block® Junior retaining walls are constructed from individual, dry-stacked blocks and do not require mortar or pins. They rest on a compacted sub-base levelling pad. Concrete lugs at the front of the unit function as an interlocking mechanism between the units. They also help maintain a constant, wall-face angle during construction. These units are high strength, durable and long lasting.
Allan Block® Junior retaining wall system can be installed as gravity walls or as geosynthetic reinforced walls depending on the loading, height and strength of the retained soil.
The system offers extensive design flexibility allowing curves, corners, slopes, steps, terraces and wall heights up to 2.5m high. Walls over 900mm in height (and in some instances lower, depending on soil, site conditions and surcharge), require engineering design and the use of geosynthetics.
Colours:
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Actual colours may differ. All coloured product should be ordered at the same time and mixed on site from several pallets to ensure blending and to avoid colour contrasts.
Suitable for:
Any retaining wall application from 200mm to 2.5m in height. Allan Block® is typically used for residential and landscaping applications.Sizes:
| Nominal Size | Units per m2 | ||
|---|---|---|---|
| Allan Block® Junior Units |  | 240x216x200mm | 23.3 |
| Allan Block® Cap Unit |  | 260x432x80mm | 2.3 per metre of wall length |
| Allan Block® Corner Unit |  | 196x400x200mm |
Frequently asked questions:
What factors do I need to consider when planning a wall?
Walls over 900mm high need to be designed by an engineer. Other walls may also require an engineer’s design, due to factors such as weak soils or slopes, if the wall needs to support traffic surcharge, or if the wall is in close proximity to boundaries.
Can walls be built on uneven or sloping ground?
Yes. An Allan Block® wall adapts easily to a sloping base. Starting at the lowest area, simply step the footing up as the wall advances up the slope.
How are the corners created?
External corners are created by using the Allan Block® Corner block. Internal corners can be formed by the intersecting blocks.
How many blocks will I need?
For the Allan Block® system, one square metre of wall requires 22 blocks. There are 4 blocks to one lineal metre or wall.
What can I use to backfill the wall?
It is preferable to use sub-base materials. You can, however, use silt and clay backfill (behind the drainage material) for low gravity walls (walls lower than 900mm). For walls supporting load surcharge like driveways or slopes, the wall is must be specifically designed for the use of such materials.
When is geogrid reinforcing required?
- With walls 900mm or more in height.
- Where the ground is sloping.
- Within close proximity to boundaries.
- With walls supporting loads, such as vehicles and building foundations.
How do I protect the wall against graffiti?
Apply an anti-graffiti coating on areas most exposed to public access immediately following installation. To remove graffiti, use a low pressure cleaning process.
How do I remove moss and mould from the wall?
Any reputable moss and mould remover can be used. High pressure water blasting may damage the surface of the block and is not recommended.
For more information on Allan Block, visit www.allanblock.com
