Block Retaining Wall – Loose Lay

block retaining wall

Loose lay retaining wall blocks are concrete blocks that have a nib cast on the underside. (see photo) This stops each block slipping forward of the block below.

There are a number of different manufacturers and most produce more than one type of block. You will normally find several different types of block in any [read more...]

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Retaining Walls – Gabbions


Gabbions are big wire baskets filled with rocks.

The baskets are typically available for retaining wall use in 1m x 1m x 2m units. and you arrange the rock fill yourself.

Gabbion walls can be described as a Permeable, Steel Reinforced, Low Skill, Dry Stone Wall.

read more…]

Retaining Walls – Sleeper Wall Details

Post and sleeper retaining wall

Here are some details I would be using to build a retaining wall with galvanized steel posts up to 800mm high. This is not a guarantee that these details will be suitable for your application.


I would want to be building it in reasonable ground such as Hard Clay, Compacted Coarse Sand, or [read more...]

Retaining Wall – Sleeper Walls

timber retaining wall

Although most people refer to these as Sleeper Walls the Technical term is ‘Post’ and ‘Whaling’ * Walls.

The posts can be Galvanised Steel like the example on the right.

Other alternatives are timber sleepers, like the example below, or even round timber posts.

For Whalings the choices are:

Timber Sleepers, Probably the most popular [read more...]

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Retaining Wall Drainage

impermeable retaining wall export

I’ve previously posted about the importance of Drainage Behind a Retaining Wall to minimise the forces acting on the wall…. here is some advice on how to make sure it works.

The first thing to consider is this is drainage of the water in the soil. You should aim to properly drain surface water away [read more...]

Geotextile around Drainage Pipes


When researching about installing agricultural drains you will find some books recommend that you place a geotextile in the trench before the initial gravel and then wrap the geotextile over the gravel afterwards. Its something I used to do.

You can also buy agi pipe with a geotextile ‚Äúsock’ around it like this:

The [read more...]

Retaining Wall Fairness

retaining wall export 3

In Western Australia subdivisions are usually completed with retaining walls in place on the boundary so that all blocks are level.

For the rest of us if we are faced with a sloping site a retaining wall may be needed before you can build…………..but who pays?

Here are a few examples

Block A is sloping [read more...]

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Understanding Retaining Walls

retaining wall

Its quite usual when you have a sloping site to need a retaining wall to make the land you build on level, or just have a flat garden.

Retaining walls however are not simple structures. They have to withstand significant loads and need to be properly designed and constructed to avoid failure.

Loads On [read more...]