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Thanks for this i will look into calcs to see where im at. I have attached a quick sketch to show proposed wall there is returns in it does this do anything to it to provide stability? Its not completely freestanding i dont think?

Hi thanks for the reply... to be honest i havent put much thought into the founds do you think they are insufficient? i was thinking of putting in 8 pillars every 3 metres? You said the blocks dont have to be 7N necessarily but what about density/weight of blocks is a thermalite for example...

Hi i am about to begin a diy project on my back garden and create a boundary wall in 4 inch concrete blocks. The wall will be 23 metres long and 1.8metres in height(6ft). The plan was to to do the wall single skin and add 1 block pillars on the back side at intervals to strengthen the wall...