Commercial Interlock and Pavers

Thickness follows traffic and product rating. Pedestrian commercial areas often use about 60 mm units, while vehicle areas commonly use 80 mm or thicker pavers under an engineered pavement design. Large-format slabs behave differently and need their own loading review. Base and restraint are as important as unit thickness.

Depth depends on subgrade strength, frost susceptibility, drainage, axle loads, traffic repetitions, and whether the area is pedestrian, parking, loading, or fire route. Harrowgate follows the geotechnical design, removes weak soil, and compacts controlled lifts. A generic shallow base is not suitable for every commercial site.

Yes, when the slab is sound, has appropriate slope and drainage, and the detail provides stable bedding and restrained edges without trapping water at thresholds. Cracks, joints, drains, and height transitions must be reviewed. A failed or flat slab should not simply be hidden beneath new pavers.

The units have wider drainage joints filled with clean angular stone, over an open-graded bedding and reservoir base that stores and conveys water. Fines contamination sharply reduces performance. Underdrains, overflow, soil infiltration, and maintenance are designed together. Conventional sand and dense base cannot be substituted into the system.

Excavated trench backfill and cover collars often compact differently from the surrounding base, creating a settlement ring. Harrowgate rebuilds the full section, compacts difficult edges with appropriate equipment, anchors restraint around the frame, and sets the cover to the finished plane before bedding and pavers are completed.

A stable compacted base, full joint material, effective drainage, and routine sweeping limit movement and organic accumulation. Weeds usually establish in surface debris rather than growing from deep soil. Stabilized joint products can help conventional systems where compatible, but they are not used in permeable joints that require open drainage stone.

Provide layout and grading plans, geotechnical report, paver type and pattern, traffic classification, base detail, drainage, edge restraint, utility structures, accessible features, phasing, and material samples. Harrowgate verifies excavation quantities, disposal, compaction, cuts, transitions, and protection so the quote covers the complete pavement section.