Thanks for the link, just what I was looking for.
I really appreciate your help guys, but I think I may have caused some confusion. I need to build a fence across concrete, and a small section of block paving. My main question was about the fencing on the concrete.
I am looking to put a fence up across a concreted area in my back garden but I am unsure of how high a fence these post anchors can support. If I use 4"x4" anchors will they support a 5ft fence? And how long do the bolts need to be? How high a fence can 3"x3" anchors support? Is there a...