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.
Building a retaining wall out of landscape timbers.
The base of the retaining wall should be half the wall s height.
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.
Dig a trench 12 inches deep around perimeter of retaining wall.
Dig a foundation trench for the first row of timbers image 3.
How to use landscape timbers for a retaining wall 1.
If the distance is greater than 8 drive additional stakes so that the gaps do not exceed 8.
Use landscape marking paint to outline the area where the retaining wall will be built.
Excavate the bottom of the slope to create a level base for the wall.
Make the trench about 8 inches deep.
Drive stakes into the ground at each end.
Wood retaining wall instructions set up wooden stakes and nylon strings to represent the height and perimeter of the retaining wall.
Connect the stakes with a string and adjust until it is level images 1 and 2.
Place the first row of landscape timbers in place 2 inches out from the dug out bank or where you are planing to.
Drill 1 2 inch wide holes through the ends of each timber with a hole drill bit and hammer an 18 inch long metal.
Retaining walls can be constructed using a variety of materials from poured concrete and large timbers to natural stones even bricks.