An overlay places new asphalt over an existing pavement structure. It is faster and less expensive than full reconstruction, but it depends on a stable base, controlled cracking, workable elevations, and drainage that will not trap water under the new mat. Full repave or reconstruction removes failed material and rebuilds the pavement section so the new surface is not inheriting the old failure.
| Condition | Overlay may work | Full repave is safer |
|---|---|---|
| Cracking | Moderate cracking with limited movement after crack treatment. | Alligator cracking, pumping, or cracks returning quickly after repair. |
| Drainage | Positive drainage and no persistent ponding. | Low spots, ponding, failed transitions, or saturated base areas. |
| Elevations | New height will not break ADA slopes, thresholds, or curb reveal. | Overlay would bury curbs, change accessible routes, or create trip hazards. |
| Budget | Owner needs a shorter-term capital bridge. | Owner wants a longer lifecycle and fewer repeat disruptions. |
The Scope Items That Matter
A defensible overlay bid should identify milling limits, leveling course, fabric or interlayer if used, crack treatment, base repair allowances, tack coat, compaction requirements, traffic control, striping, and ADA responsibility. If those items are vague, two overlay bids may not be comparable at all.
ADA Can Change the Answer
Adding height can alter slopes, transitions, accessible stall grades, and routes from parking to building entries. If the overlay affects an accessible route, get the ADA implications documented before approving the scope.