![]() Boulder walls may have unpredictable performance, particularly as there may be less contact between stones.Cannot be constructed in a tight space, as gravity walls require mass and width for stability, therefore taking up a greater footprint (depth).Suitable to install in shallow rock and limited or no footings are required. ![]() Mid-range in terms of cost effectiveness.These gravity-type walls have been in use since ancient times (some are still standing), but there are things for you to consider. These walls use heavy, generally broad-based materials to harness gravity and give the wall strength and stability. Cut Stone (Sandstone) / Boulder / Gabion Walls Sawn dimensional sandstone retaining wall, with steps and custom letter box, utilising a single and double row to create a garden terrace. Not all councils or developers will allow timber walls on boundaries.For timber walls over 800mm and on a boundary, obtaining the required H5 treated timber to give the required 60-year design life can be difficult and expensive.They cannot be waterproofed effectively so water will run through.If there is shallow rock, it can be difficult or impossible to install the posts/bored piers.There are many options in terms of aesthetics, whether timber species or coloured and patterned concrete sleepers.Concrete sleeper walls with galvanised steel posts meet the required 60-year design life in AS4678. ![]() Horizontal timber or concrete wales are attached behind near vertical posts inserted into concrete footings. This is your “garden variety” type of retaining wall that most people see in their mind’s eye. Image courtesy of Prime Concrete Developments. The cheap and quick way might cause you more trouble than it’s worth later on, so take the time to do it right, whatever the size of the job.Ī concrete sleeper retaining wall, featuring a charcoal block pattern. These are available from industry bodies such as Timber Queensland or your hardware retailer. Basically, retaining a stable low-risk bank is not considered to require a ‘structural’ wall.īut even for small, 400mm (or less) do-it-yourself or home handyman walls, there are recommended guidelines for design and construction regarding factors such as depth of posts, wales, batter, drainage and backfill. While NSW requires engineering design for any retaining wall over 600mm, the Brisbane, Ipswich and Gold Coast councils generally only require this at 1m or higher. While AS4678 is a national retaining wall design standard for walls over 800mm, it’s important to note that local and state government requirements vary around Australia.
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