How to build footing for raised concrete planter?

[sujoy_kb]

It is a 15m x 5m backyard where I want to erect a concrete planter made of limestone bricks with walls on all 4 sides. I want a long narrow planter of 15m x 0.5m x 1m. The base is sandy soil (class C), so please suggest how should I construct the footing as it is a DIY. Please also suggest what material should I use for the footing so that it doesn't crack due to expansion and contraction.

[sujoy_kb]

Thanks @MitchellMc .

I’ll use stone clad on them so should be okay with concrete blocks. However, do you think the block dimensions are okay? 400x200x100 is what I’m planning to use.

[MitchellMc]

You could use Brighton Masonry 390 x 190 x 90mm Besser Blocks, and then the cladding will bring them close to your original size.

Mitchell

[sujoy_kb]

That’s a great suggestion as always @MitchellMc  Thanks so much 

[sujoy_kb]

@MitchellMc @Do I stack the bricks on each other by 390x90 side?

[MitchellMc]

Yes, the blocks will sit on their 90mm edge @sujoy_kb.

Mitchell