How do I tie a new Vancouver patio into existing concrete?

Connecting new interlock pavers to an existing concrete surface is one of the most common patio transitions in Metro Vancouver, and the key is creating a stable, level edge connection that accommodates the height difference between the two surfaces.

The fundamental challenge is that a properly built paver patio sits on 6-8 inches of compacted gravel base plus 1 inch of bedding sand, which means the finished paver surface needs to match the height of the adjacent concrete. Before you plan anything, measure the existing concrete surface height relative to the surrounding grade — this tells you how deep you need to excavate and whether you have enough room for a full base without ending up with pavers sitting higher or lower than the concrete.

The transition edge itself is the most critical detail. Pavers cannot simply butt up against a raw concrete edge without support — the bedding sand will migrate under the concrete over time, and the pavers along the edge will drop. The correct approach is to use a rigid edge restraint (aluminum L-channel or snap-edge plastic restraint) spiked into the compacted base right at the concrete edge, so the last row of pavers is held firmly against the concrete face. Some installers also apply a bead of construction adhesive (PL Premium or equivalent) between the last paver and the concrete face for additional stability, though this is optional if the edge restraint is properly installed.

Height matching is where most DIY attempts go wrong. Your finished paver surface should be flush with or very slightly above (no more than 5mm) the existing concrete — never lower, which creates a water trap and a trip hazard. Work backwards from the concrete height: concrete surface height minus 1 inch (bedding sand) minus paver thickness (typically 60mm / 2-3/8 inches for a patio) equals the height your compacted gravel base needs to reach. If the existing concrete is sitting high relative to grade, you may need to reduce base depth or use a thinner paver — this is worth calculating before you excavate.

Metro Vancouver Drainage Considerations

This is where Vancouver's climate makes the transition detail more demanding than in drier regions. The joint between the paver field and the concrete edge is a natural water collection point. Rain running across the paver surface hits the concrete and, if the slope isn't right, pools at the transition. Your paver field needs a minimum 2% slope (1/4 inch per foot) directed away from the house and away from the concrete transition if the concrete is at the low end of the run. If the existing concrete slopes toward the new paver area, you may need to introduce a linear drain or channel drain at the transition to intercept that water before it saturates the paver base.

Clay soils — common in Surrey, Burnaby, Delta, and Langley — make drainage even more critical here. Water that pools at the concrete-paver transition will find its way into the base, soften the subgrade, and cause the edge pavers to sink within a season or two.

Practical Tips

Use 80mm pavers at the transition row if the patio will see any foot traffic near the edge — the extra thickness adds stability at the most vulnerable point. Cut pavers to fit tight against the concrete using a diamond-blade wet saw rather than a dry-cut angle grinder — clean cuts reduce the gap at the joint and look far more professional. Fill the joint between the last paver and the concrete with polymeric sand, not caulk — caulk cracks and looks poor within a year in Vancouver's wet climate. Polymeric sand allows slight movement while resisting washout.

If the existing concrete has a control joint or expansion joint running parallel to your new paver edge, align your transition there — it's a natural break point and reduces the visual awkwardness of the connection.

This is a project worth having a professional assess before you start, particularly if the existing concrete is cracked, settled, or at an awkward height relative to your planned patio grade. A qualified installer can evaluate whether the concrete edge is stable enough to build against, or whether it needs to be cut back and repoured before the paver work begins. Vancouver Interlock can match you with an experienced local contractor for a free estimate — find hardscape professionals through the Vancouver Construction Network at vancouverconstructionnetwork.com.