Garden retaining wall 9" concrete hollow blocks.

[Andiy2014]

I'm planning to build a garden retaining wall in 9" concrete hollows with 12mm rebar. The wall is 2.8m long and 1.6m high. My question is how wide and deep should my footings be and how many & what spacing should the rebar be?

Any help and advise gratefully received ? Thanks

 

[ree]

It all depends on how much pressure is going to come on to the wall from the retained ground?

Your footing can be twice the width of the block and 150mm deep.

Two re-bar can go into the footing, and vertical re-bar tie into one of the footing re-bars at every block for a v. strong wall (or every second block for a normal strength).

Horizontal re-bar at each lift of blocks. Tied in to vertical re-bar.

all re-bar tied in with wire and to be 3/8" or 1/2"

All the above might be overkill for you but it gives you an idea to suit your circumstances.

Bitumen on the back of the blockwork will give a leaching free face for some years.