How do I plan a clean transition from Ottawa paver to garage slab?

The key to a clean paver-to-garage transition is creating a level, stable edge where your interlock meets the concrete slab, typically using a concrete or steel edge restraint that's flush with both surfaces. This prevents the pavers from shifting away from the garage and creates a smooth, professional appearance that handles Ottawa's freeze-thaw cycles.

The most critical element is edge restraint installation. Your interlock pavers need a rigid border to prevent lateral movement, especially important in Ottawa where freeze-thaw cycling can shift unrestrained pavers significantly. A concrete edge restraint (typically 100mm wide by 200mm deep) should be poured along the garage foundation, with the top surface flush with your finished paver height. This creates a permanent, stable edge that won't move with frost heaving. Steel edge restraints are an alternative but must be heavy-duty commercial grade (not thin residential edging) to handle Ottawa's soil movement.

Height coordination is crucial — your finished paver surface should be 6-12mm below the garage slab to allow for slight settling while preventing water from flowing toward the building. The concrete slab likely sits on a substantial foundation extending below the frost line, while your paver base will be shallower. This height difference must be calculated during base preparation. Your Granular A base layer should be precisely graded so that when pavers and bedding sand are installed, the final surface slopes away from the garage at minimum 2 percent grade.

Base preparation at the transition zone requires extra attention. The area within 1 metre of the garage foundation should have geotextile fabric installed over the subgrade before placing Granular B sub-base, as this transition zone experiences the most stress from differential settling between the deep garage foundation and shallower paver base. Compact the granular base in 100mm lifts rather than the standard 150mm lifts near the foundation to ensure maximum density.

Drainage management is critical in Ottawa's climate. Install a narrow concrete or polymer concrete channel drain along the garage foundation if water tends to collect in this area. The channel should connect to your driveway's main drainage system or a catch basin. Never allow water to pond against the garage foundation, as freeze-thaw cycling can create ice dams that damage both the foundation and adjacent pavers.

Cutting and fitting pavers at the transition requires precision. Use a masonry saw with a diamond blade to cut pavers for tight fits against the concrete edge. Leave a 3-5mm gap between cut pavers and the concrete restraint, then fill with polymeric sand or non-shrink grout for a clean appearance. Avoid using partial pavers smaller than one-third of a full unit, as these shift easily and create maintenance issues.

This is definitely professional contractor work — the edge restraint must be properly formed, reinforced, and poured to the correct height, while the base grading requires precise elevation control and compaction. A quality paving contractor will coordinate the edge restraint installation with your paver laying to ensure perfect height matching and proper drainage slopes. The transition zone is the most visible part of your driveway and the most likely to show problems if not executed properly.

Find local paving contractors experienced with interlock installations through the Ottawa Construction Network directory at justynrookcontracting.com/directory?trade=paving for professional execution of this critical detail.