If you're considering a retaining wall for your Minneapolis-Saint Paul property, understanding drainage is essential. The number one cause of retaining wall failure is water pressure buildup behind the wall—a problem that proper drainage completely prevents.
The Science of Hydrostatic Pressure
When water accumulates in the soil behind a retaining wall, it creates hydrostatic pressure. This pressure pushes against the wall with tremendous force. In Minnesota's climate, this problem is compounded by freeze-thaw cycles that can cause saturated soil to expand.
Signs of Poor Drainage
- Leaning or tilting walls
- Cracks in wall surface
- Water seeping through wall face
- Bulging sections
- Soil erosion at wall base
Professional Drainage Solutions
Drainage Aggregate
Behind every properly built retaining wall is a layer of drainage aggregate—typically clean crushed stone. This allows water to flow freely down to the drainage system instead of building up pressure.
Perforated Drain Pipe
A perforated pipe at the base of the wall collects water and directs it away from the structure. This pipe should connect to a proper outlet that allows water to drain safely away from your property.
Filter Fabric
Geotextile filter fabric prevents soil from clogging the drainage aggregate while still allowing water to pass through freely.
Why DIY Retaining Walls Often Fail
Many homeowners attempt to build retaining walls without understanding the critical importance of drainage. While the wall may look fine initially, water problems often develop within a few years, leading to costly repairs or complete replacement.
Professional Installation in the Twin Cities
At Design Build Landscapes MN, every retaining wall we build includes comprehensive drainage systems designed for Minnesota's challenging climate. We understand local soil conditions, frost lines, and water management requirements.
Ready to discuss your retaining wall project? Contact us for a free consultation, or call (612) 445-4295.