Treated Pine Retaining Wall Specifications

Restrained basement walls gravity walls and segmental retaining walls both gravity and with geogrids.
Treated pine retaining wall specifications. Member sizes and post embedment depths shall be as outlined in tables 1 and 2 for preservative treated softwood and hardwood respectively. 1 5m for walls under 1 5m. Timber queensland limited technical data sheet 9 timber retaining walls revised march 2014 page 1 timber is a preferred material for landscaping purposes. Treated pine is a wood such as radiata pine with is treated with cca copper chromium and arsenic to prolong its life.
Materials timber may be used in sawn sizes approximating landscape. Manufactured from southern yellow pine. Losp treated timber is great for appearance applications such as external joinery due to it leaving the light coloured appearance unchanged after treatment. If the proposed retaining wall location has adjacent structures or facilities with post disaster functions or failure of the wall may result in significant damage or risk of life a structural geotechnical engineer should be consulted.
Retaining walls in particular contribute significantly to the surroundings when constructed from timber. Walls exceeding 400 mm high should have a 1. Retaining wall member construction schedule 2 3 soil type post centre. Products preservatives uses and standards are described in the sfpa publication pressure treated southern pine download in publications.
I will always like the sleeper wall use a larger post size to the rails and i tend to use winged splits for the rails these give a better bonding surface. Other topics include sheet pile walls tilt up retaining walls soldier pile walls gabion walls counterfort walls pilaster walls and walls with pile or pier foundations. The natural appeal and versatility of timber is ideal for this application. 10 batter as shown.
Jobsite fabrication cuts and borings should be field treated with copper naphthenate having a minimum 2 metallic solution in accordance with awpa standard m4. Cca is used for the control and prevention of damage to timber and timber structures by insect wood rot wood fungus and general timber decay. Retaining walls up to 1 m high timber retaining walls up to one metre high can be constructed as shown in figure 1. So adding up the thicknesses equals 275mm 11 minimum out from the face of the fill or the cut the material you need to retain.
2 the schedule does not permit surcharge loads to the walls. Losp treated pine has long lasting protection against decay and insect attack. Pressure treated pine lumber has been treated for ground contact so it is ideal for use as retaining walls decks walkways and other outdoor projects. Acq alkaline copper quaternary acq is a water borne preservative treatment of pine timber.
It has a smooth texture and can be painted or stained. Cantilever treated pine retaining wall specifications 1 check availability of 250 275 and 300 diameter posts before specifying these timbers.