Installing a fence on top of a limestone wall

Arguably, one of the tidiest looking Colorbond fence installations sits upon limestone blocks. Why the tidiest? Because instead of the Colorbond posts being concreted into a hole in the dirt, a neat, round hole is core drilled straight into the limestone blocks for the fence posts to sit in, then filled up with concrete nice and cleanly.

If there is a height difference in the soil between properties, that is if one house pad sits up higher than the other, installing a limestone retaining wall on the boundary will mean the fence can sit squarely on the boundary, with equal amounts of limestone block on either side.

uneven earth levels between block for retaining perth

Above: Prior to installing the large limestone blocks, an old asbestos fence was removed as well as some limestone garden edging. A tree stump had to be removed, and a string line set up to see what else might be in the way. The timber screening put in place further down the fence line was to add height and privacy for both neighbours, since previously the fence sat lower (not on top of the retaining).

Limestone block 1metre

Above: Once all obstacles along the string line are removed, the dingo can be brought in to lift the blocks into place (these big blocks weigh 240kg each!).

limestone block retaining

Above: One course of large, one metre limestone blocks have been installed to make up the height difference between neighbouring properties, ready for the installation of a new Colorbond fence.

colorbond fencing installed onto limestone retaining blocks

Above: All of the Colorbond fence post holes are core drilled into the limestone blocks.

colorbond fence and limestone block retaining Perth

Above: The completed Colorbond fence with infill panels now installed, sitting atop the limestone blocks.

When installing a Colorbond fence and a limestone wall separately, be aware that any steel used to reinforce the limestone may present an issue in core drilling the holes for the Colorbond fence posts. New drill bits for a core driller can be costly, so talk to your fence installer prior to giving the go ahead on the limestone installation. Using larger limestone blocks can prevent the need for reinforcement.