Most Garden Walls lack sufficient protection from rain and heavy frost. Thus the bricks at the top of the wall, start to spall and breakdown. The damage continues through the wall and eventually the wall weakens or becomes unstable!
Brick-on-Edge upon couple of courses of Creasing Tiles, for years has been a popular way of providing a finish too many walls on most Housing Developments.
However, due to the use of Perforated Engineering Bricks on the Brick-on-Edge detail, many walls have been left with the Brick on Edge badly spalling and disintegrating.
Therefore, in recent years I have reverted back to becoming a big fan of Coping Stones and Pier Cappings. From a practical and longer lasting aspect to the Brick on Edge, there is no comparison.
With the Brick on Edge, we have constant mortar bed joints at 75mm intervals, with added mortar work of sand and cement fillet along the top arris of the creasing tile.
It is therefore common for rain to pond on the surface of the Bricks and breakdown the joints. Once frost hits the damaged damp surface the bricks will eventually breakdown and spall.
A good quality Coping Stone should oversail the wall by at least 30mm either side, allowing the weather drip to be placed sufficiently away from the face of the wall.
Coping stones, normally are manufactured in 600mm modular sizings, although some companies will make larger units.