How deep should base be under a Vancouver walkway?

For walkways in Metro Vancouver, you need a minimum 6-inch (150mm) compacted gravel base, though 8 inches is recommended for clay soils and high-traffic areas. This depth accounts for Vancouver's heavy rainfall, clay-heavy soils, and the need for proper drainage beneath your pavers.

The base depth isn't arbitrary — it's engineered for Metro Vancouver's specific conditions. With over 1,200mm of annual rainfall and clay soils prevalent across Surrey, Richmond, Delta, and parts of Burnaby, water management is the primary concern for any interlock installation. A shallow base (3-4 inches) might seem adequate initially, but it will saturate during Vancouver's October-to-March rainy season, causing pavers to shift, settle unevenly, and create trip hazards within 1-2 years.

Proper base construction for Vancouver walkways starts with excavating to the full depth — typically 9-10 inches total to accommodate the 6-8 inch base plus 1-inch bedding sand layer. Install geotextile fabric directly on the clay subgrade to prevent soil migration into your gravel base over time. Use 3/4-inch minus crushed gravel (also called road base or crusher run) and compact it in 2-inch lifts using a plate compactor. Each lift must achieve 95%+ compaction before adding the next layer. The base should slope away from your house at minimum 2% grade (1/4 inch per foot) to direct water away from the foundation.

Clay soil considerations are critical in Metro Vancouver. Clay doesn't drain well and expands when wet, creating an unstable subgrade. If you encounter clay during excavation, consider increasing your base depth to 8 inches and ensure the geotextile fabric completely separates the clay from your gravel base. In Richmond, where the water table is particularly high, you may need to install a perforated drain pipe at the base of the excavation to manage groundwater.

Cost implications for proper base depth on a typical 100 sq ft front walkway run $300-600 for materials (gravel, geotextile, bedding sand) plus labour for excavation and compaction. Skimping on base depth to save $200-300 upfront typically results in $2,000-4,000 in repair costs within 2-3 years when the walkway settles and requires complete reconstruction.

When to hire a professional: While small garden stepping stone paths can be DIY projects, walkways over 50 sq ft connecting your front door to the street should be professionally installed. Proper excavation depth, laser-level grading, systematic compaction, and precision screeding of bedding sand require professional tools and experience. The cost difference between DIY and professional installation is often less than the cost of fixing a failed DIY base.

Need help finding an interlock installer? Vancouver Interlock can match you with experienced contractors who understand Metro Vancouver's soil and drainage requirements.