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Diamond Lake Slabs - Installation Instructions

The installation instructions below are intended as a guide only for installing sand-set architectural slabs. For pedestal-set installations, consult ICPI Tech Spec #14 and the design guidelines for the chose pedestal system.

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 soil type, climate, drainage, and moisture. Pedestrian applications should have a minimum base thickness of 4 inches (100 mm) after compaction.

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 architectural slabs 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 slabs in the desired pattern, moving outward in a triangular pattern. Chalk lines snapped on the bedding sand or string lines pulled across the slabs can be used to maintain straight joint lines. The joint widths between slabs should be approximately 1/8 inches (3 mm). Cut slabs can be used to fill in gaps along the edges of the project. Be sure to mix slabs from multiple pallets to achieve a consistent color blend.

Step 7:
After placing an area of slabs, lightly compact them using a vibrating plate compactor. Place sheets of plywood or cardboard between the compactor and the slabs to prevent scuffing.

Step 8:
Sweep dry joint sand into the joints. At the end of each day, all slabs within 3 ft. (1 m) of the laying face should be compacted. Install any remaining edge restraints.