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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.
Timber retaining wall corner construction. Step 2 cut posts to length with circular saw. 10 batter as shown. Dig a foundation trench for the first row of timbers image 3. Use a tape measure to work out the length of your wall and how much timber you ll need.
Before you start plan out the length and height of your retaining wall. Building approval and certification local authorities generally do not require building approval or engineer certification for retaining walls up to 1 metre high. How to install a retaining wall step 1. The minimum stress grade for sawn timber should be f7 for softwood and f14 for hardwood.
Timbers that support structural loads are required to be stress graded to as 2082. Sawn timbers are a popular choice in retaining wall construction and for in ground contact are usually unseasoned treated or naturally durable. Connect the stakes with a string and adjust until it is level images 1 and 2. 600mm plus height of the wall and 150mm for final adjustment.
Place a string line 50mm out from the front face of your post. 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. Step 3 better homes and gardens step 4 half fill. Step 3 stand a post in 1 hole make plumb and level.
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. For retaining walls greater than 1 metre high refer to technical data sheet 9. Excavate the bottom of the slope to create a level base for the wall.
Brace and concrete posts. Build a retaining wall step 1 use post hole digger to dig 2 end post holes 600mm deep. 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. This data sheet contains timber queensland s recommendations for the construction of timber garden walls up to 1 metre high.
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. 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. Member sizes and post embedment depths shall be as outlined in tables 1 and 2 for preservative treated softwood and hardwood respectively. How to build a timber retaining wall 1.
The base of the retaining wall should be half the wall s height. Make the trench about 8 inches deep. Walls exceeding 400 mm high should have a 1.
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Walls exceeding 400 mm high should have a 1. Make the trench about 8 inches deep. The base of the retaining wall should be half the wall s height.
