Garden retaining wall 9" concrete hollow blocks.

14 Sep 2014
Reaction score
United Kingdom
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
Sponsored Links
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.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links