CGI Driveway & Pavers Nationwide

CGI Driveway & Pavers: The Sunnyvale Owner’s Guide

We stock and install CGI-compatible driveway and paver systems in Sunnyvale, with most replacement projects running $7,000-$18,000 for paver driveways and $4,500-$12,000 for concrete, depending on substrate condition and square footage. Most CGI paver resets and section replacements can be scheduled within 48 hours, and we carry common CGI edge restraints, bedding sand specs, and paver thicknesses on our trucks. Homeowners usually notice the problem first as shifting or sinking after rain, or individual pavers rocking underfoot where the bedding layer has washed out.

Call (650) 405-3637

Which CGI Models This Applies To

CGI, or Concrete Grid Interlocking, isn’t a single brand name but a construction method used across multiple paver product lines including Belgard’s Cambridge Cobble, Techo-Bloc’s Villagio, and several regional precast suppliers. The critical identifier is the grid pattern and the specific paver thickness, typically 60mm or 80mm for residential driveways in Sunnyvale. To confirm what you have, check the edge restraint for a stamped series name, or measure a lifted paver: CGI systems rely on a precise sand bed gradation, ASTM C33 concrete sand, and a specific joint width, usually 1/16 to 1/8 inch, to maintain interlock.

The OEM-versus-aftermarket question for CGI matters less than the spec match. We source from Belgard and Techo-Bloc, both of which manufacture to the same dimensional tolerances as original CGI-spec pavers, and we verify color batch consistency by pulling from the same production run. A common Sunnyvale gotcha: older CGI installations near Lakewood Village used 50mm pavers before the city adopted current load-bearing standards, and dropping a 60mm replacement into that grid without adjusting the sand bed throws the entire surface plane off.

Signs Your CGI Driveway & Pavers Is Failing

• Pavers rock or wobble underfoot. The bedding sand has eroded or compacted unevenly, breaking the interlock that distributes weight across the grid. In Sunnyvale’s clay-heavy soils, this often follows a winter where water pooled rather than draining through the joints.
• Sunken or low spots, especially near the garage or street apron. The aggregate base, typically Class II road base in our market, has settled or was inadequately compacted during original installation. Vehicles backing over the same path accelerate the depression.
• Weeds or grass growing through joints. The polymeric sand or jointing material has washed out, leaving voids. This isn’t cosmetic; open joints let water penetrate to the base layer, which leads to freeze-thaw damage even in mild California winters.
• Edge restraints pulling away or cracking. Plastic or aluminum edge restraints degrade in UV exposure, and once they fail, the lateral pressure of vehicle traffic pushes pavers outward. We see this frequently on north-facing driveways in Sunnyvale that stay damp.
• Efflorescence, a white powdery film on paver surfaces. This is mineral salt migration from the concrete itself, not structural failure, but heavy efflorescence often signals excessive moisture trapped beneath the pavers due to a compromised drainage bed.

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Replacement Cost & What’s Included

For a full CGI paver driveway replacement in Sunnyvale, expect $7,000-$18,000; a concrete driveway runs $4,500-$12,000. The range reflects square footage, base repair depth, and whether we need to address drainage with a channel or French drain. Driveway sealing, at $250-$700, is separate and scheduled 60-90 days after installation to allow efflorescence to purge.

Every quote we write breaks out material, labor, and any base remediation separately. Under Clause 1 of the Haven Standard, that written price is fixed before work starts; no change proceeds without a signed change order. Our 365-Day Done Right Promise covers the installation, and we pull permits when the scope requires it, with inspections passed before we consider the job closed. You’ll receive a documented photo record of the excavated base, the compacted aggregate layer, and the finished surface.

DIY or Call Us?

What you can safely check: lift a paver at the edge and confirm the sand bed depth, look for standing water patterns after rain, and photograph any stamped markings on the paver itself for identification. What goes wrong fast: re-leveling without plate-compacting the base in lifts, using play sand instead of ASTM C33, or skipping edge restraint anchoring. A CGI driveway is only as good as what’s underneath it, and we’ve been called to Sunnyvale homes where a weekend reset turned into a full re-do because the base wasn’t addressed.

Measure it twice, write it down, then build it. If you’re seeing multiple symptoms or any base settlement, call (650) 405-3637 and we’ll scope it properly.

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