A retaining wall is a soil-and-water project, not just a row of blocks.

Why drainage matters behind a wall

Water adds pressure and can move soil. Surface runoff above the wall and water that reaches the backfill should be considered as part of the project rather than treated as an afterthought.

What changes wall requirements?

• Total wall height and geometry
• Soil type and foundation conditions
• Slope above or below the wall
• Driveways, structures or other loads near the wall
• Water and drainage conditions
• Whether reinforcement is needed

Drainage components are site-specific

Segmental retaining-wall systems commonly use free-draining aggregate and may use a drain pipe, but those components should not be treated as a universal solution for every water source. Surface water may also need to be directed away from the wall.

When should engineering be discussed?

Local code and site conditions control. Industry guidance from CMHA recommends checking local requirements and notes that larger or more complex segmental retaining walls may need site-specific engineering. Walls near structures, steep slopes or significant loads deserve particular attention.

What should a homeowner show during the estimate?

• Where the grade changes and where the wall would start/end
• Any downspouts, drains or wet areas nearby
• Driveways, sheds, fences or structures close to the wall
• Desired steps, curves or planting areas
• Access for excavation and materials

Talk through the actual property

General guides are useful for preparation, but the final scope depends on the site. Infinite Outdoor Construction can review the property, access and project goals during an estimate.