Timber retaining walls have two significant advantages. The first is that they are generally cheaper, although this advantage has been eroded as timber has become more expensive in recent times, while the price of synthetic materials has reduced.
The second advantage is that timber retaining walls are generally more pleasing to the eye, and certainly make for a better look when flowers and shrubs are planted in amongst your timber retaining wall.
One consideration is how big your retaining walls newcastle is going to be, and how much pressure is going to build up behind it. A large retaining wall that has to withstand a lot of pressure will need an engineer’s report and a council permit. A small retaining wall, say a foot high and only 6 foot wide, is something that the owner may be able to build comfortably themselves over a weekend; for this a timber retaining wall may be suitable and will be easier to work with than most other forms of retaining wall.
The nature of a retaining wall means that pressure is greatest at the base, and less at the top, making a timber retaining wall particularly suitable for low walls. Generally the timber, the amount of timber below the ground should be equivalent to the amount of timber above the ground.
Treated timber should always be used to prolong the life of your timber retaining wall, and you may need to protect the base of the timber against rotting. In this regard the amount of water likely to build up behind your retaining wall is a factor to consider, as these the steps you take to drain water away from a timber retaining wall. You should always include filter gravel and excess filter cloth in the construction of the wall. Untreated timber is also likely to attract termites, which could lead to a problem much bigger than your timber retaining wall.
An often overlooked cost is the cost of removing a timber retaining wall, so extending the life of your timber as much as possible is a great idea.
Finally, for a timber retaining wall , location may be a factor. If you live on the coast the salt air is a factor that is far different to that faced by those living inland.