Richmond sits barely a metre above the Fraser River—the city’s average elevation is just one metre above sea level. That’s the number that shapes every pavement job here. When you’re building on deltaic silt and peat, asphalt thickness alone won’t save you. The ground compresses. It shifts. Our work in flexible pavement design starts with that reality. We’ve seen too many parking lots and industrial yards fail because the structural section looked fine on paper but ignored what was underneath. A solid CBR road subgrade assessment is the first move. Without it, you’re guessing. Richmond’s high water table adds another layer of complexity. Saturated subgrades lose strength fast. That’s why we tie every design back to field data collected right here, not generic assumptions from a textbook.
Designing asphalt on Richmond’s peat without a subgrade model is like framing a house on a waterbed—it might hold up for a while, but it won’t stay level.
Methodology applied in Richmond BC
Demonstration video
Critical ground factors in Richmond BC
A loaded tri-axle dump truck is what we use to simulate worst-case pavement stress during field checks. On Richmond’s River Road corridor, we’ve watched a fully loaded 25-tonne truck produce instantaneous deflection in a freshly compacted base simply because the underlying silt hadn’t been given enough time to drain. Skipping a proper geotechnical investigation means you’re designing blind. The biggest risk isn’t the asphalt mix—it’s the untreated organic layer 1.5 metres below. When that decomposes or consolidates unevenly, you get longitudinal cracking that runs the full length of the lane. In our experience, a grain size analysis combined with Atterberg limits tells you more about pavement longevity than any asphalt specification. Ignore the fines content and you’ll be resurfacing within five years.
Our services
We tailor each pavement package to the site’s loading conditions and subgrade profile. Here’s what that includes in Richmond.
Subgrade Investigation
Boreholes and test pits across the footprint to map the peat depth, silt consistency, and water table. We sample every major stratum for lab testing.
Pavement Structural Design
Layer thickness calculations using AASHTO and MEPDG methods. We specify asphalt binder, granular base, and any stabilization layer required.
Construction Phase Verification
Field density testing and proof rolling during placement. We confirm compaction levels and base stiffness before the first lift of asphalt goes down.
Frequently asked questions
How much does a flexible pavement design for a Richmond commercial lot typically cost?
For a standard commercial lot in Richmond, the full pavement design package—including subgrade investigation, lab testing, and structural design—generally runs between CA$2,310 and CA$6,460. The range depends on lot size, number of boreholes, and whether stabilization measures like lime treatment need to be designed.
Why does Richmond’s soil make pavement design more complicated?
Richmond is built on the Fraser River delta, so we’re dealing with deep deposits of compressible silt and peat. These soils consolidate slowly under load, which causes differential settlement. The high water table also keeps the subgrade saturated, reducing its strength. A standard pavement section from a drier inland site won’t work here—we need thicker bases and sometimes chemical stabilization.
What’s the difference between flexible and rigid pavement for this area?
Flexible pavement uses asphalt layers over a granular base. It’s more forgiving of the settlement we get in Richmond—it can flex without cracking as severely as concrete. Rigid pavement (concrete slabs) offers higher stiffness but is much less tolerant of uneven subgrade movement. For most commercial and municipal work here, flexible pavement is the practical choice unless there’s a specific reason for concrete, like heavy point loads from container handling.