Garage floor concrete takes more abuse than almost any other surface on a residential property — vehicle traffic, oil and chemical exposure, moisture from the outside, and seasonal temperature cycling all act on it over time.
Repair: appropriate for isolated damage
Crack routing and filling, small spalled areas, and isolated damaged sections can be addressed with targeted repair when the remainder of the slab is structurally sound.
Resurfacing: for surface deterioration over a sound slab
If the garage floor has surface spalling or pitting but the slab is structurally stable, resurfacing with a polymer-modified overlay can renew the surface. Resurfacing is only appropriate when the slab itself is sound — applying an overlay over a failing base will delaminate quickly.
Full replacement: when the slab or base has failed
Replacement is necessary when the slab has settled significantly, has cracking through the full thickness, shows evidence of ongoing moisture infiltration, or sits on a base that has failed.
The moisture question
Moisture wicking up through the slab indicates a drainage or waterproofing issue beneath the slab. Any surface treatment applied over active moisture will delaminate. Moisture must be addressed before any surface work makes sense.
Related: Garage Floors service · Repair vs. Replacement · Pricing · FAQ