Full-depth reclamation (FDR) is the better choice when a pavement has failed through the asphalt and into the base, and the existing material can be pulverized, stabilized and compacted in place into a new base. If the distress is only at the surface, a mill and overlay is usually enough; if the base is failing, FDR rebuilds it without hauling the old pavement off or trucking new rock in.
For paving contractors, municipalities and property owners around St. Louis and St. Charles County, that difference matters. Our clay subgrades hold water, freeze-thaw cycles open cracks every winter, and a lot of parking lots and streets were built on thin base decades ago. Overlaying a failed base just buys a few seasons before the same cracks come back.
What is full-depth reclamation?
FDR recycles the existing asphalt and the base under it into a new, stabilized base. A reclaimer pulverizes the pavement and base to the depth the engineer specifies, a stabilizing agent is spread at the rate set by the lab mix design, and the reclaimer mixes it to a uniform blend. The crew then grades and compacts the reclaimed layer, the owner's testing agency checks it, and the paving contractor places new asphalt on top.
The agent, application rate and depth come from the engineer of record and the mix design, not from the contractor. That keeps the result tied to a design instead of a guess.
When should you choose FDR over remove-and-replace?
FDR fits best when the problem is structural and covers a large, continuous area. Signs that the base, not just the surface, has failed include:
- Alligator (fatigue) cracking across wide areas, not just at joints
- Rutting in wheel paths and truck lanes
- Potholes that keep coming back after patching
- Pumping or soft spots where water comes up through cracks
- Previous overlays that cracked back through within a few years
Remove-and-replace still makes sense for small, isolated failures, for areas where grades or drainage have to change a lot, or where there are many utility structures and shallow conflicts in the treatment zone. A good bid compares both approaches on the same quantities so the owner sees the real tradeoff.
Why does FDR save time and trucking?
The biggest savings come from what doesn't leave or arrive on trucks. With conventional reconstruction, the old asphalt and base are excavated, loaded and hauled to a recycler or landfill, and new aggregate base is hauled in, placed and compacted. On a large parking lot or a municipal street, that can be hundreds of truckloads through neighborhoods or active business entrances.
With FDR the existing material stays on site and becomes the new base. That usually means:
- Fewer haul trucks on local roads and in the parking lot
- Less disposal and less imported rock to buy
- A shorter window before the paving crew can start
- Less disturbance to the subgrade below, since it isn't dug out and exposed
What should a paving contractor or municipality check before choosing FDR?
FDR is not a fit for every job. Before you commit, work through these with your engineer:
- Cores or test pits to confirm asphalt thickness and base type
- A lab mix design to set the stabilizing agent, rate and depth
- Locations and depths of utilities, inlets, manholes and valve boxes in the treatment zone
- Finished grades and drainage: FDR can adjust grades somewhat, but large changes need planning
- Traffic control and phasing for streets or occupied lots
- Testing requirements and who performs them
Utility locates are especially important on older St. Louis streets and commercial lots, where records are often incomplete. Our hydrovac crews can pothole utilities ahead of the reclaimer so there are no surprises at depth.
How does FDR fit with a paving contractor's schedule?
Many asphalt contractors in the St. Louis area don't own reclaimers or stabilization equipment, and they don't need to. A common setup is for the paving contractor to hold the prime contract and bring in a stabilization subcontractor to reclaim and compact the base. Once the testing agency accepts the base, the paving crew takes over. Clear handoff points on grade, compaction and timing keep both crews moving.
Weather matters. Stabilization needs workable moisture and suitable temperatures, so plan FDR work for the main construction season and leave room in the schedule for rain days.
FDR questions we hear often
Is FDR only for roads?
No. It works on parking lots, municipal streets, truck courts and other large asphalt areas where the base has failed.
Does FDR replace the need for a geotechnical engineer?
No. The engineer of record and the lab mix design set the agent, rate and depth. The contractor builds to that design.
Can FDR be combined with subgrade stabilization?
Yes. Kuesel's in-house crews also perform lime and cement soil stabilization, so soft subgrade and base reclamation can be handled by one team. Our lime vs. cement vs. undercut guide covers that decision in more detail.
Get an FDR price for your St. Louis project
Kuesel Excavating has been doing heavy civil work in Missouri and Illinois since 1963, and our soil stabilization and FDR crews work across St. Louis and St. Charles County. Send us your plans, cores or geotech report through our bid invite and we'll respond within one business day, or call (636) 978-3478, Monday through Friday, 7am to 4pm.