The hidden cause most builders miss
The most critical part of your retaining wall is the part you will never see: the drainage system installed behind it.
Without heavy-duty agricultural pipe wrapped in geofabric and backfilled with clean drainage aggregate, water becomes trapped in the soil mass behind the wall.
This hydrostatic pressure builds with every rain event. No matter how thick the concrete sleepers or how solid the posts looked on installation day — a wall with no drainage path will eventually fail. It is the single most common reason we are called in to replace walls that are less than 10 years old.
