What is mill and overlay, and when does a lot need it?
Mill and overlay removes the worn top layer of asphalt with a milling machine and replaces it with fresh asphalt. It costs less than a full rebuild and goes much faster. It is a good fit when the base is still firm and the damage is in the surface layer.
It makes sense when you see:
- Raveling, where stones are coming loose from the surface.
- A rough, oxidized surface with many hairline cracks.
- Low spots that hold water, which milling and regrading can correct.
It does not fix a failed base. Interconnected alligator cracking, deep ruts and soft areas are cut out and rebuilt first, then the whole lot is overlaid. We check this on the site visit and list it in the quote. Milling also lets the finished height match curbs, drains and doors.
