concrete H4 post

[stu2]

Hi and thanks

starting retaining walls from 400mm high to 1m high .

using 150 mm rounds at 1.1 spacing ?

how many bags concrete per hole ?

Will be going approximately 50%of lengths in ground 

thanks again 

[EricL]

Hello @stu2 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your retaining wall.

Just a friendly reminder that your retaining wall might need a permit depending on where you are located. For example, in NSW anything over 600mm will need a building approval or permit from your local council. 

In regards to the number of bags of concrete, it all depends on the size and depth of the hole you'll be digging, less the diameter of the post you'll be putting in. 

My best advice is to use Bondall 1L Monocel In Ground Timber Protector - 1L to add extra protection to your post.

Here is a handy step-by-step guide: How To Build Retaining Wall.

If you have any other questions we can help with, please let us know.

Eric

[stu2]

Great starting point 

thanks