CGI Driveway & Pavers Nationwide

CGI Driveway & Pavers: The Cupertino Owner’s Guide

CGI driveway and paver systems in Cupertino typically run $7,000-$18,000 installed for a standard paver driveway, or $3,500-$11,000 for a paver patio, depending on substrate condition and the specific CGI series you have. We stock CGI-compatible edge restraints, bedding sand, and joint stabilization materials, and we can usually assess your system within 24-48 hours. Most Cupertino homeowners discover a CGI paver issue when they notice shifting after winter rains or joint sand washing out down the slope toward the street.

Call (669) 202-9618

Which CGI Models This Applies To

CGI, or Concrete Grid International, produces permeable paver systems and structural grass pavers under several series names. The Grid-Lock and Turf-Block lines are the most common in Cupertino residential applications, particularly in the Monta Vista and Rancho Rinconada neighborhoods where hillside drainage is a design constraint. To identify your series, look for the molded grid pattern: Grid-Lock has a square cell roughly 2.5 inches across, while Turf-Block uses a larger octagonal opening. The part number, if visible on any original documentation, starts with “CGI-GL” or “CGI-TB” followed by the cell depth in millimeters.

The OEM edge restraint for CGI systems is a high-density polyethylene strip with integrated stakes, but we regularly source an equivalent from Belgard that matches the flexural spec and installs with the same setback from the pavement edge. The aftermarket equivalent saves roughly 15-20% on material cost without changing the install method. If your CGI system was installed before 2015, check whether it uses the older snap-fit edge restraint or the current continuous-roll design; the two are not interchangeable, and mixing them is the most common compatibility error we correct in Cupertino.

Signs Your CGI Driveway & Pavers Is Failing

• Pavers shifting or rutting under vehicle weight. This usually means the aggregate bedding layer has washed out or was never compacted to 95% standard Proctor density. In Cupertino’s clay-heavy soils, especially below-grade in the foothill zones, water infiltration softens the subgrade and the grid loses its load-distribution function.
• Joint sand bleeding onto the surface after rain. The polymeric sand or stabilized joint material has degraded, or the original installer used untreated kiln-dried sand that migrates. Once the joints empty, the interlock between pavers fails and the pattern loosens.
• Weeds growing through the grid cells. This indicates the geotextile fabric beneath the base course has torn or was omitted. On CGI Turf-Block systems, this is often the first visible sign because the root zone is supposed to be contained above the structural layer.
• Standing water in grid cells more than 30 minutes after rain stops. The permeable design depends on open-graded base stone; if that layer has clogged with sediment, or if the original install used the wrong stone gradation, water backs up instead of draining to the subsoil.
• Edge restraints pulling away from the pavement perimeter. The plastic stake anchors have sheared, or the restraint itself has UV-degraded and become brittle. Cupertino’s 250-plus annual sunny days accelerate this; we see it most on south-facing driveways after eight to ten years.

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Replacement Cost & What’s Included

The wide range on full replacements reflects three variables: whether the existing base course can be salvaged, the access difficulty for excavation equipment, and whether your CGI system ties into a city storm-drain connection that requires permit work. Under Clause 1 of the Haven Standard, we deliver a written price with line-item costs for base, pavers, edge restraint, and joint materials before any work starts. Our 365-Day Done Right Promise covers the installation, and the documented photo record we provide shows the excavated subgrade, the compacted base lift, and the finished surface so you have evidence of what was done.

DIY or Call Us?

An owner can safely inspect their CGI system for the symptoms above: walk the surface after rain, check for loose edge restraints by hand, and photograph any grid pattern distortion for reference. What goes wrong with DIY is the excavation and base work. Removing even a few square feet of failed CGI pavers requires cutting the grid, excavating to the subgrade, recompacting the base in lifts with a plate compactor, and regrading for drainage. Without the right compaction equipment, the repair sinks within a season. We also see homeowners use standard concrete sand in the joints instead of the specified ASTM C-144 or polymeric product, which voids the permeability and traps water.

Measure twice, document once, explain it plainly. If you’re seeing multiple symptoms or the failure covers more than a few feet, call (669) 202-9618 to schedule your free estimate. We’ll assess the subgrade, identify your CGI series, and give you a written scope with named materials and a fixed price.

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