At Cornell Engineers we don’t subscribe the idea of using timber for retaining walls because of durability issues (early breakdown of timber that is constantly moist) and construction issues (timber retaining walls are rarely built well).
Because of this risk we tend not to design and certify timber retaining walls. We much prefer concrete masonry walls for structural retaining walls.
However if you really would prefer to use timber in a retaining wall then there’s a manual published by Timber Queensland that you should have a look at.
It’s really useful manual on timber retaining walls (for residential applications).
Here’s the link to Timber Queensland’s timber retaining wall manual.
Landscape gardeners or builders can build your timber retaining wall for you.
We’re sorry – but we won’t design or certify timber retaining walls.