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Roman Cobblestone - Installation Instructions

These installation instructions are intended as a general guide only.

Step 1:
Excavate to the design levels.

Step 2:
Compact the subgrade to at least 95% of standard Proctor density as specified in ASTM D 698, unless under constant vehicular traffic - then use modified Proctor density as specified in ASTM D 1557.

Step 3:
Place and compact a base of 5/8" (16 mm) minus crushed rock in layers of not less than 4" (100 mm) to a smooth uniform surface to the grade and cross section required. The minimum surface tolerance of the compacted base should be 3/8 in. ( 10 mm) over a 10 ft (3 m) straight edge.

The thickness of the base materials is determined by traffic, soil type, climate, drainage, and moisture. Pedestrian applications should have a minimum base thickness of 4 inches (100 mm) after compaction. Residential driveways should have a minimum sub-base thickness of 6 inches (150 mm) after compaction. Minimum base thickness for residential streets are 8 to 10 inches (200-250 mm), however a qualified civil engineer should be consulted to determine appropriate design and thickness.

Step 4:
Install the edge restraint system to prevent settling and spreading. Follow specifications and manufacturers instructions for installing edge restraints. Consult ICPI Tech Spec #3 for more information.

Step 5:
Bedding sand under interlocking concrete pavers should meet ASTM C 33 or CSA A23.1 specifications. Bedding sand should be spread and screeded to a thickness of 1 to 1 1/2 inches (25-40 mm). Use screed pipes and a straight and true strike board to level the bedding sand.

Step 6:
Begin in one corner of the project and begin laying pavers in the desired pattern, moving outward in a triangular pattern. Chalk lines snapped on the bedding sand or string lines pulled across the pavers can be used to maintain straight joint lines. The joint widths between pavers should be approximately 1/16 to 1/8 inches (2 - 3 mm). Cut pavers should be used to fill in gaps along the edges of the project. Be sure to mix pavers from multiple pallets to achieve a consistent color blend.

Step 7:
After placing an area of pavers, compact them using a vibrating plate compactor capable of exerting 3,000-5,000 lbs. (1300-2200 kN) of centrifugal compaction force operating at 75-90 hertz. Make at least two passes to ensure that pavers have been seated in the compacted bedding sand.

Step 8:
Sweep dry joint sand into the paver joints and compact the pavers again until the joints are full. Compaction should be within 3 ft. (1 m) of an unrestrained edge or laying face. At the end of each day, all pavers within 3 ft. (1 m) of the laying face should be compacted. Install any remaining edge restraints.