Commercial Paver Installation Specifications

Most commercial paver failures look the same: settled pavers at vehicular thresholds, joint sand erosion at the field edge, surface dishing where the base wasn't deep enough, or rocking pavers along an edge restraint that wasn't sized for the load. Every one of those failures traces back to a specification problem — wrong paver thickness for the load, wrong base thickness for the soil, or wrong edge restraint for the use.

The good news: the specifications are not mysterious. The Concrete Masonry & Hardscapes Association (CMHA — formerly the Interlocking Concrete Pavement Institute, ICPI, before the 2024 rebrand) publishes Tech Spec sheets covering nearly every commercial install scenario, and CSI MasterFormat Section 32 14 13 (Precast Concrete Unit Paving) gives architects and specifiers a standardized framework. The bad news: the specifications are routinely ignored when bids get tight, and most facility managers don't have a way to verify that what was bid is what was installed.

This guide walks through the specifications that actually matter for commercial paver installation at the pedestrian and light-vehicular scale — from the paver itself down through the base, edge restraint, bedding, and joint material. Heavy-vehicular paver applications (fire lanes, drive aisles serving trucks, loading docks, industrial pavement) are out of scope; those are civil-scale paving projects better served by a heavy-paving contractor.

Paver thickness by load category

CMHA Tech Spec defines paver thickness by load category. For commercial pedestrian and light-vehicular applications, two thicknesses cover virtually all the work:

60mm pavers (2-3/8 inch) are the standard for pedestrian applications: walkways, plazas, courtyards, entry approaches, and pedestrian commons. They're the standard tier for commercial pedestrian work and they're the wrong choice for any application that will see vehicular traffic, even occasional.

80mm pavers (3-1/8 inch) are the standard for light-vehicular applications: passenger-vehicle drive lanes and parking, residential-style commercial drives, and ADA-accessible walkways with occasional service-vehicle access. The thickness premium over 60mm is small (typically $1–$3 per square foot at the paver itself), but the install premium reflects deeper base and stricter compaction.

The most common spec failure on commercial paver bids is using 60mm pavers in any application that will see vehicular traffic. The pavers are visually identical to the heavier-duty version. They look fine for the first year. They start tipping and rutting in the second year as traffic loads accumulate, and within three to five years the install requires reset or replacement.

Specifiers writing CSI Section 32 14 13 should explicitly call out paver thickness by zone — pedestrian areas at 60mm, light-vehicular areas at 80mm, distinguished on the drawings. Bids should reference CMHA Tech Spec 11 (Mechanical Installation of Concrete Pavers) and Tech Spec 17 (Bedding Sand Selection for Concrete Pavers).

Base preparation: the part that determines pavement life

The base under the pavers does more to determine longevity than the pavers themselves. Standard interlocking concrete paver installations follow a layered system:

Subgrade: Native soil, properly prepared. Compacted to at least 95% Standard Proctor density for light-vehicular applications. If the subgrade is poor (clay, organic soils, fill), it gets stabilized — typically with geotextile separation fabric and additional aggregate base depth. Skipping subgrade preparation is the #2 cause of commercial paver failure after wrong paver thickness.

Aggregate base: Dense-graded aggregate (DGA), typically Ohio Department of Transportation Item 304 or Kentucky 304 specification, compacted in lifts. Base depth scales with load:

• Pedestrian: 4–6 inches of dense-graded aggregate, compacted in lifts
• Light-vehicular (passenger-traffic only): 6–8 inches of dense-graded aggregate

Base depth is not optional based on what the soil "looks like" on install day. Per CMHA Tech Spec 2 (Construction of Interlocking Concrete Pavement), base depth comes from the design pavement section, which considers subgrade CBR (California Bearing Ratio), expected loads, and freeze-thaw conditions. Cincinnati corridor freeze-thaw exposure pushes base depth toward the higher end of the typical commercial range.

Bedding sand: A 1-inch thick layer of properly graded bedding sand (per CMHA Tech Spec 17) directly under the pavers. Critical detail: the bedding sand is not the joint sand. Many commercial installs incorrectly use the same material for both, which causes premature joint sand erosion and paver settling.

Pavers: Set on the bedding sand, plate-compacted into final position with the joint sand swept and re-compacted multiple times.

Joint sand: Fine washed sand (or polymeric sand for premium installs) swept into the paver joints and compacted. Joint sand width per CMHA is 1/16 to 3/16 inch — wider joints reduce the interlocking action that gives the pavement its structural performance.

Edge restraint: the failure mode bid omissions favor

Edge restraint is the structural element at the perimeter of the paver field that prevents lateral movement. Without it, paver edges spread under load, joint sand erodes, and the entire field starts unraveling from the outside in.

Per CMHA Tech Spec 3 (Edge Restraints for Interlocking Concrete Pavements), commercial pavers require:

• Concrete edge restraint for light-vehicular applications — a poured concrete curb or beam at the edge, typically 6 inches deep by 6 inches wide, set at least 6 inches below the bottom of the paver. This is non-negotiable for any paver field that will see passenger-vehicle traffic.
• Plastic or aluminum edge restraint can be acceptable for pedestrian-only applications but is generally insufficient for commercial light-vehicular use.
• Existing curbs or building foundations can serve as edge restraint where they exist, but the paver-to-edge transition has to be designed for it.

Bids that omit edge restraint to come in lower aren't comparable to bids that include it. A 5,000 square foot commercial paver plaza with proper concrete edge restraint costs $12,000–$25,000 more than the same plaza without — but the plaza without edge restraint will need full reset within 5–10 years, which is more expensive than the original premium.

CSI Section 32 14 13 reference

Architects and specifiers writing commercial bid documents should reference CSI MasterFormat Section 32 14 13 (Precast Concrete Unit Paving). A complete spec includes:

• Paver manufacturer, style, color, thickness, and shape (ASTM C936 paver unit standard)
• Base aggregate gradation (ODOT 304 or KY 304) and depth by zone
• Bedding sand gradation (per CMHA Tech Spec 17)
• Edge restraint type and detail (per CMHA Tech Spec 3)
• Joint sand specification (washed sand or polymeric)
• Compaction requirements (Standard Proctor density, typically 95%)
• Slope and drainage requirements
• Tolerances (typical: ±1/4 inch over 10 feet for surface variation)
• Quality control testing requirements (compaction)

Specs that leave any of these to "contractor's option" or "manufacturer's recommendations" create ambiguity that gets exploited at bid time. The more specific the spec, the more apples-to-apples the bids — and the less likely the install fails because someone substituted a cheaper material.

What this means for facility managers comparing bids

When you're reviewing commercial paver bids, three verification points:

One: confirm paver thickness by zone. If the bid doesn't differentiate between pedestrian and light-vehicular paver thickness — or specifies 60mm pavers throughout — and the installation includes any vehicular use, the bid is undersized.

Two: confirm base depth. A bid that specifies a 4-inch base for light-vehicular paver installation is undersized for commercial loads. Light-vehicular commercial paver applications need 6–8 inches of dense-graded base.

Three: confirm edge restraint. If the bid doesn't include a line item for concrete or aluminum edge restraint, ask why. The cost of edge restraint is material; omitting it to lower the bid is a guarantee of premature failure.

For our paver installation services, see our commercial paver installation page. For ADA compliance considerations on paver walkways, see our ADA-compliant commercial walkway guide. For the broader commercial landscape RFP guidance covering plant material, sod, and topsoil specs, see our commercial landscape RFP guide.