Concrete that is sinking, heaving, badly broken, crumbling deep below the surface or sitting over failing support is usually not a good candidate for resurfacing. Resurfacing works on concrete that is structurally sound but worn, stained or damaged at the surface.
Because a resurfacing layer bonds to the slab underneath, any problem in that slab becomes the new surface’s problem too. Knowing the warning signs can save you from paying for a fix that won’t last.
Movement and Settlement
If parts of a slab have sunk, tilted or lifted, resurfacing will follow those uneven shapes. It won’t make the concrete level again. Slabs that are still settling may also crack the new surface as they move.
Settlement usually needs to be addressed first, either by restoring support where practical or by replacing the affected sections.
A slab that rocks underfoot, has hollow-sounding areas or shows gaps along its edges may have lost support in places. Those are worth checking before planning any surface work.
Deep Damage and Weak Concrete
Resurfacing is meant for problems at or near the surface, like light scaling, minor pitting, stains or worn finishes. It’s a different story when concrete is soft, crumbling or breaking apart well below the top layer. An overlay needs something strong to bond to. Weak concrete underneath can let the new surface delaminate or flake off.
Exposed or rusting reinforcement is another warning sign. That kind of damage usually needs repair work that goes beyond a new surface.
Extensive Cracking or Water Problems
A few stable cracks can often be repaired and covered. A slab with cracks running through much of its area, or cracks that keep growing, is a different situation. Those cracks may come back through the overlay, and they can point to support or drainage problems.
Water flowing under or along a slab can wash out the base and keep the concrete moving. In North Carolina, heavy rain makes this a common concern for driveways and patios with poor drainage. Resurfacing does not fix drainage. If water problems aren’t addressed, they can shorten the life of any surface treatment.
Old coatings, sealers or paint can also get in the way. If they can’t be removed properly, the new layer may not bond well, even on otherwise good concrete.
What to Do Instead
When a slab isn’t suited to resurfacing, the answer may be targeted repairs, leveling where appropriate, or replacing damaged sections. The choice depends on the extent of the damage and the cause. Our concrete replacement page explains when removing and replacing concrete makes more sense.
Our concrete resurfacing services begin with checking whether the existing slab can support a new surface. If you’re unsure whether your Burlington concrete qualifies, we’re happy to evaluate it and talk through options.
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