Truncated Domes
Cast-in-Place vs Surface-Applied Truncated Dome (2026)
Cojo
Invalid Date
7 min read
Compliance disclaimer: Always verify current requirements with your local jurisdiction. This article reflects 2026-05-07 specifications under ADA Standards 705 and 36 CFR Part 1191.
The single biggest install-method choice on a truncated dome project is whether the panel goes into wet concrete (cast-in-place) or onto cured concrete (surface-applied). The decision drives cost, lifespan, traffic-control window, and what the failure mode looks like five years out. This guide walks through both systems against the same ADA Standards 705 spec they share.
The 60-word direct answer: Cast-in-place truncated dome panels embed in fresh concrete during a new pour and last 15 to 25 years. Surface-applied panels bond to existing cured concrete with structural epoxy and mechanical anchors and last 7 to 12 years. Choose cast-in-place for new construction, surface-applied for retrofits where curb-ramp geometry is already correct.
| Spec | Cast-in-Place | Surface-Applied |
|---|---|---|
| Install timing | During new concrete pour | After concrete has cured |
| Bond method | Mechanical key into wet concrete | Structural epoxy plus mechanical anchors |
| Lifespan | 15 to 25 years | 7 to 12 years |
| Failure mode | Panel surface wear | Edge lift, anchor pull-out |
| Installed cost (per sq ft) | $25 to $60 | $40 to $95 |
| Best for | New construction, full ramp rebuild | Retrofit on existing curb cuts |
| ADA 705 compliance | Same dimension and contrast spec | Same dimension and contrast spec |
A cast-in-place panel is set into wet concrete during the pour. Integral keys, tabs, or ribs on the underside lock the panel into the slab as it cures. The result is a panel that is structurally part of the curb ramp and finishes flush with adjacent concrete.
The bond is mechanical and chemical. Wet concrete cures around the panel keys, and the panel becomes monolithic with the slab.
A surface-applied panel bonds to existing cured concrete. The crew grinds the surface to remove sealers and laitance, applies a structural epoxy bed, presses the panel into the epoxy, and locks it down with stainless mechanical anchors. The panel sits proud of the slab by roughly 0.2 inches, which is the dome height itself.
Traffic-control windows for surface-applied work are short, which is part of why retrofits go this route.
For step-by-step retrofit instructions, see how to install surface-applied truncated dome.
The biggest spread between the two systems is at year 7 to 10.
Cast-in-place panels typically wear from the top down. Domes lose their corners and the surface roughens, but the panel stays bonded to the slab. End of useful life is when the panel can no longer pass an LRV recheck under ADA Standards 705.2 or the dome geometry no longer hits 705.1 dimensions.
Surface-applied panels typically fail at the edges. Plowing, freeze-thaw, and pedestrian shoe scrub all attack the perimeter sealant. Once water gets under the panel, the epoxy bond degrades and the panel lifts. End of useful life is usually a corner lift large enough to be a tripping hazard.
In Oregon snow zones (Bend, Hood River, La Grande), surface-applied lifespan trends to the lower end of the 7 to 12 range. In the Willamette Valley, the same product runs at the upper end.
Industry Baseline Range
| Scope | Cost (Oregon I-5 corridor) |
|---|---|
| Cast-in-place panels, supply and install (new pour) | $25 to $60 per square foot |
| Surface-applied panels, supply and install (retrofit) | $40 to $95 per square foot |
| Slope correction prior to surface-applied retrofit | $1,500 to $5,500 per ramp |
| Traffic control on a single curb-cut retrofit | $400 to $1,800 per day |
Through 2026, surface-applied retrofit pricing is being held up by structural epoxy material cost (ASTM C881 epoxies have moved with petrochemical pricing) and tightening Portland and Salem traffic-control requirements. Cast-in-place pricing tracks concrete more directly. For per-curb-cut versus per-square-foot math, see truncated dome cost per square foot.
In February 2026, Cojo retrofitted four curb cuts at a 22,000-square-foot Eugene retail strip where the original 2014 ramps had no detectable warnings. The ramps already passed slope per ADA 405, so the scope was surface-applied panels only. We installed federal yellow composite panels (24 inches by ramp width) using ASTM C881 Type IV epoxy and stainless mechanical anchors. Total install was six working hours including traffic control. Edge sealant gets re-tooled at year three on the lifecycle plan.
That same site, if it had been new construction, would have been a one-day cast-in-place job sequenced into the original concrete pour, at roughly half the per-curb-cut cost. The retrofit premium pays for itself when the alternative is tearing out compliant ramps.
Use this in roughly this order:
For the city-level install perspective, see truncated dome installation in Eugene.
Cojo installs both cast-in-place and surface-applied truncated dome panels across Oregon. Our submittal packages cross-reference ADA Standards 705 and document the install with as-built measurements. Contact Cojo for a site walk and quote, or learn more about our striping services.
A practical guide to sealcoating apartment and condo parking lots. Covers phased scheduling, tenant communication, cost allocation, liability, and ROI for property value.
Get accurate 2026 asphalt paving costs for Oregon driveways, parking lots, and roads. Per-square-foot pricing, cost factors, and money-saving tips.
Compare asphalt and concrete driveways side by side: cost, durability, maintenance, appearance, and climate performance for Oregon homes.
Have a question about this topic? We'll respond within 24 hours.