Here’s a wall we found on a recent survey, apparently a well built retaining structure bit on further examination we found it wasn’t quite as good as it looked, a close up photo reveals a large fracture and what cant be seen as the tree to the land on top of this space behind the trellis.
What seems to have happened is that the retaining wall had been built without an reinforcement of plain facing brickwork – a bad start – there was an absence of any weep holes to allow water pressure behind to be relieved and then as the tree had grown the roots had pushed against the wall to create an effective “perfect storm”. Left unchecked we think the wall would have failed, what chance the VW getting away unscathed then? The wall needs to be taken down and properly rebuilt in to a design suitable for the location and environment. This wall took less then 10 years to fail and the remedial cost will be well into four figures!
Quite possibly without the tree and for a lesser height the selected solution may have sufficed but for this height and with the conditions as they were premature failure was inevitable! Always gett a structure like this properly designed, it wall almost always need to have some degree of reinforced concrete within it and weep holes are essential to allow water pressure to be relieved.