This happens when: A load is added within 3 feet of the top of the wall. The wall then leans out at the top and eventually tips over.
What to do: Plan your landscape with a Seattle Rockeries architect or engineer if a car or pool will be placed near the wall. Our retaining wall designs will include a strengthened footer and increased number of tiebacks or deadmen to add strength.
What happens: Soil behind the wall gets saturated with rain and storm water, causing hydrostatic water pressure and weight to topple the wall.