Project Installation Issue Specifications

Porous Concrete Pavers

Note: This specification guide is excerpted from Uni-Group USA's guide. This section is intended only to give an insight into items to include when developing a scope of work for a project.

Examination:

  • Verify subgrade preparation, compacted densities and elevations conform to specifications.
  • Note: Finished grade may be inch above final elevation after compaction. This is to allow for minor settling.
  • If geotextiles used, verify placement conforms to specifications and drawings.
  • Verify aggregate base materials, thickness compaction, surface tolerances and elevations conform to specifications.
  • Compaction should conform to ASTM D698 for pedestrian areas and residential driveways, ASTM D 1557 for heavy vehicular traffic.
  • Attention should be paid to stabilization of subgrade if upon weak or saturated solids.
  • Local aggregate base materials should conform to those used for highway flexible pavements or ASTM D2940.
  • Aggregate base should be spread in uniform layers not exceeding 6 inches in thickness and recommended base surface tolerance should be +/- 3/8 over a 10-ft straight edge.
  • If geotextiles used, base preparation, surface tolerances and elevations should conform to specifications
  • Mechanical tampers recommended for compaction of soil subgrade and aggregate base.

Installation:

  • Bedding sand: Do not use to fill in depressions in the base surface. Spread evenly over base course and screed to required thickness, typically a nominal 1 inch, not to exceed 1 inch thick).
  • Pavers are to be free of foreign materials before installation and installed in pattern per drawings, maintaining straight lines.

  • Joints between pavers to be per manufacturers design requirements (typically 1/16 to 3/16 inch wide but may need to be wider).

  • Fill gaps at edges of paved areas in accordance with manufacturers or designers requirements
  • Vibrate pavers, sweep dry joint sand into joints and vibrate until full repeat as necessary. Do not vibrate within 3-ft of the unrestrained edges.
  • Surface elevation of pavers shall be 1/8 to inch above adjacent drainage inlets, concrete collars or channels.

Field Quality Control:

  • After removal of excess sand, check final elevations for conformance to drawings.
  • Upon completion of work, remove any debris, surplus material, and equipment from site.

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