On 12/03/2013 13:10, Tim+ wrote:
I must admit I'd be very wary of adding a fence to the top of a wall.
Structurally they are working in very different ways and I wouldn't have
thought that it would take much wind load to risk damaging the wall. This
might account for the lack of replies to your question.

This happened near me. The 3ft brick wall came down in one piece off its
raised plinth and fell onto the pavement. Luckily there was no-one
underneath.

Andy