CGI Driveway & Pavers Nationwide

CGI Driveway & Pavers: The Walnut Creek Owner’s Guide

We stock and install CGI-compatible driveway and paver systems in Walnut Creek, with typical installed pricing from $7,000 for paver driveway work and $3,500 for paver patio installations. Most CGI part replacements and system repairs are completed in one visit, and we carry common CGI-compatible edge restraints, drainage channels, and paver base components on our trucks. Homeowners usually discover a CGI driveway or paver issue when they notice shifting pavers after winter rains, pooling water where drainage used to flow, or edge restraints pulling away from the border - problems that start small in Walnut Creek’s clay-heavy soils and worsen with each freeze-thaw cycle through the Diablo Valley.

Call (510) 686-6370

Which CGI Models This Applies To

CGI, or Concrete Grid Interlocking, isn’t a single brand name but a system type used by multiple paver manufacturers including Belgard’s Aqua Roc line, Techo-Bloc’s Permeable series, and several regional suppliers serving the Bay Area. The critical identifier is the grid pattern stamped into the paver surface and the corresponding edge restraint profile, which must match for the interlock to hold under vehicle load. Look for a raised manufacturer stamp on the paver edge - usually on the driveway’s border course where wear hasn’t obscured it - and measure the grid spacing; CGI systems run either 60mm or 80mm thickness, and mixing the two in a repair causes failure within two seasons.

OEM CGI pavers from Belgard or Techo-Bloc typically run 15-25% above equivalent-spec aftermarket product, but the color match is exact. Aftermarket equivalents exist from Basalite and Calstone, and we source both; the decision depends on whether the repair is a patch or a full border replacement. For Walnut Creek homes in the Saranap or Lakewood areas where we have done full driveway replacements, we have found that aftermarket edge restraints hold equally well if the base preparation follows the manufacturer’s ICPI spec, but color drift after three years is real. We document the source on every quote so you know what you’re getting.

Signs Your CGI Driveway & Pavers Is Failing

• Pavers rocking underfoot or tire. The bedding sand has washed out or compacted unevenly, breaking the interlock that distributes load across the CGI grid. In Walnut Creek, this follows improper base drainage or a failed edge restraint that lets the field spread.
• Standing water where the surface used to shed it. The permeable joint material has clogged with fine silt, or the CGI grid’s drainage cells are blocked with compacted soil from below. Clay subsoil in the Ygnacio Valley area accelerates this.
• Edge restraints pulling away or heaving. The plastic or aluminum restraint has cracked from UV exposure, or the spikes anchoring it have rusted through. Walnut Creek’s summer heat peaks above 100°F, and cheap restraints become brittle in five to seven years.
• Weeds growing through joints in a previously clean surface. The polymeric sand or joint stabilizer has degraded, opening gaps where seeds collect. This signals the surface seal is also failing, which accelerates paver fading.
• Visible settling near the garage apron or street transition. The aggregate base was insufficiently compacted during original installation, or the CGI grid has punched through the base layer under point loads from delivery trucks or garbage haulers.

Before

After

Replacement Cost & What’s Included

CGI driveway and paver repair in Walnut Creek ranges from $400 for isolated edge restraint and re-leveling work to $14,000 for full driveway replacement, depending on square footage and whether the base layer can be salvaged. Paver patio installation runs $3,500-$11,000; driveway sealing, which extends CGI system life by protecting joint sand, is $250-$700. Our quotes are flat prices with written scope - under Clause 1 of the Haven Standard, the number you agree to is the number you pay, and no change proceeds without a signed change order.

Every CGI repair includes removal of failed material, base re-compaction to 98% Proctor density where disturbed, replacement with specified pavers and edge restraints, polymeric sand installation, and a documented photo record of before, during, and after. We warranty workmanship for 365 days under the Done Right Promise. If the substrate is unsalvageable, we tell you before we price the patch - no one benefits from a repair that fails in eighteen months.

DIY or Call Us?

An owner can safely check whether paver rocking is isolated or widespread by walking the surface and marking loose units with chalk. You can also clear debris from drainage channels and verify that downspouts aren’t dumping directly onto the paver field. What you cannot safely assess is base integrity; lifting a paver tells you nothing about the four to six inches of compacted aggregate beneath it, and driving a vehicle over a partially repaired CGI grid risks punching through to the native soil.

Edge restraint replacement looks simple but requires a plate compactor and proper spike spacing - 12 inches on center for flexible restraints, closer near curves. Without compaction, the restraint lifts within a season. For anything beyond spot re-sanding, call (510) 686-6370. We carry CGI-compatible edge restraints, drainage fittings, and base aggregate on our trucks, and we pull the permits when the scope requires it.

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