My client, had awful problem with his rear Garden wall's coping of Brick-on-Edge and tile creasing, were disintegrating at an alarming rate.
My client had even taken the step of removing the brick coping as the continuous crumbling of the bricks was a nuisance.
Disintegration of Brick-on-Edge is a problem a problem I see constantly these days. It seems the Engineering Bricks used on main ly developments in the past 20 years are of an inferior quality, with the bricks spalling at an alarming rate. My view nowadays is more in favour of a concrete or stone coping stone or pier capping. Ultimately cheaper, longer lasting and protects the top of the wall a lot better than a creasing tile.