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Scope this document is intended to provide guidance for the design and construction of timber retaining walls in residential settings and shall not be used where design or construction exceeds any of the following limits or exclusions.
Timber retaining wall corner construction. Excavate the bottom of the slope to create a level base for the wall. Member sizes and post embedment depths shall be as outlined in tables 1 and 2 for preservative treated softwood and hardwood respectively. If it s going to be 5 feet 1 5 m tall make sure your posts are 5 feet 1 5 m tall with an additional 18 inches 46 cm on top. Angle the hole to allow posts to lean back towards the area being retained at a ratio of 1 10 so the posts lean 100mm for every 1m of height.
Walls exceeding 400 mm high should have a 1. We are replacing an old. Build a retaining wall step 1 use post hole digger to dig 2 end post holes 600mm deep. The minimum stress grade for sawn timber should be f7 for softwood and f14 for hardwood.
There is more flexibility for those used in above ground environments with seasoned sawn timber also an option. This data sheet contains timber queensland s recommendations for the construction of timber garden walls up to 1 metre high. Connect the stakes with a string and adjust until it is level images 1 and 2. 10 batter as shown.
Construction of either log or sawn or combinations timber retaining walls in residential applications. Excavate two 550mm deep holes for the end posts pour in concrete to 600mm from the top use a spirit level to check for plumb in both directions then check the post is the right height. Figure 1 typical retaining wall construction retaining walls up to 1 m high timber retaining walls up to one metre high can be constructed as shown in figure 1. Brace and concrete posts.
Building approval and certification local authorities generally do not require building approval or engineer certification for retaining walls up to 1 metre high. 600mm plus height of the wall and 150mm for final adjustment. Place a string line 50mm out from the front face of your post. How to install a retaining wall step 1.
The base of the retaining wall should be half the wall s height. Dig a foundation trench for the first row of timbers image 3. Before you start plan out the length and height of your retaining wall. For retaining walls greater than 1 metre high refer to technical data sheet 9.
How to build a timber retaining wall 1. Use a tape measure to work out the length of your wall and how much timber you ll need. Step 3 stand a post in 1 hole make plumb and level. Timbers that support structural loads are required to be stress graded to as 2082.
Step 3 better homes and gardens step 4 half fill. If your retaining wall is over 1m you will need to angle your posts. If your retaining wall is going to be 40 feet 12 m long you need 14 posts 40 length of the wall divided by 3 space between each post for your wall.
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If your retaining wall is going to be 40 feet 12 m long you need 14 posts 40 length of the wall divided by 3 space between each post for your wall. If your retaining wall is over 1m you will need to angle your posts. Step 3 better homes and gardens step 4 half fill.
