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Aha, I have it now, as long as the bottom of the trench for the foundation is at or below the drain invert, the load is transferred to the subsoil below the drain and not onto the drain itself. My plan was for a 450mm depth footing 450mm wide for the wall (one brick width) and expanding out...

Larger image now uploaded here: Unfotunately lost clarity in upload process, the measures are 6' for the brick pier heights and 4' for the drain depth. Pier A is one gatepost (the far left of the image), pier B is the second gatepost and pier C is the one abutting the house (far right of...

Hi all, I am after some advice about a free-standing brick wall. I want to build this in my garden, well clear of boundaries. I have spoken to building control who say I don't need approval for it. I plan to have a small (pedestrian) gateway at one end of the wall with a brick pillar...