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The wall is between 120 and 80 cm high (it's a level wall on a slightly sloping garden). Although it's single-skinned it has buttresses every couple of metres. It already has a 90cm fence on top (60cm solid panel with cane screening above) which is fixed in the method I described. I'm just fitting new posts because the new panels are different sizes (1800mm vs 5ft). Sinking the posts into the ground would be ideal, but it's not really feasible because some of them would be going into flowerbed, while others would be onto a granite patio.
ffm
How high is the brick wall? Adding nearly 1m of fence could put quite a strain on a single skin, would it be possible to sink posts into the ground?