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.
Wood retaining wall instructions set up wooden stakes and nylon strings to represent the height and perimeter of the retaining wall.
Dig a foundation trench for the first row of timbers image 3.
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.
Place the first row of landscape timbers in place 2 inches out from the dug out bank or where you are planing to.
Connect the stakes with a string and adjust until it is level images 1 and 2.
Drill 1 2 inch wide holes through the ends of each timber with a hole drill bit and hammer an 18 inch long metal.
For diy purposes opt for manufactured blocks that are.
The base of the retaining wall should be half the wall s height.
Make the trench about 8 inches deep.
If the distance is greater than 8 drive additional stakes so that the gaps do not exceed 8.
Tie a string to a stake at the wall s desired height and stretch across to opposite stake or stakes.
Drive stakes into the ground at each end.
Retaining walls can be constructed using a variety of materials from poured concrete and large timbers to natural stones even bricks.
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.