Asphalt milling is the process of grinding and removing the top layer of an existing asphalt surface so a new layer can be applied on top. It’s the first step in a mill and overlay project — the most common method of resurfacing a commercial parking lot or road without removing and replacing the entire pavement structure.
What the Process Involves
A milling machine grinds the surface to a specified depth — typically one to three inches — removing the deteriorated asphalt while leaving the base structure intact. The milled material (called reclaimed asphalt pavement or RAP) is collected and recycled. Once the surface is milled and graded, new asphalt is applied and compacted.
When Milling Is the Right Choice
- Surface deterioration without base failure. Alligator cracking, raveling, and rutting that haven’t reached the base are good candidates for mill and overlay.
- Height clearance requirements. Milling removes material before adding a new layer, keeping the finished elevation consistent with curbs, drains, and building entries.
- When overlay alone won’t hold. Paving directly over a failed surface traps the problem underneath. Milling removes the failure before new asphalt is applied.
When Milling Is Not Enough
If the base structure beneath the asphalt has failed, milling and overlay won’t fix the underlying problem. In those situations, full depth reclamation or reconstruction addresses the base rather than just the surface.
Freequently Asked Questions
How long does asphalt milling take?
Annually, ideally in early spring after the winter freeze-thaw cycle. This timing identifies new damage before peak paving season and while the maintenance budget still has room.
Can the lot stay open during milling?
Yes. US Asphalt phases projects by section so a portion of the lot remains accessible throughout. Access requirements are planned with the property manager before work begins.
Is milled asphalt wasted?
No. Reclaimed asphalt pavement is recycled and reused in new asphalt mixes, making mill and overlay one of the more environmentally sustainable pavement rehabilitation methods.
How do I know if I need milling or just patching?
Isolated damage in one or two areas is typically a candidate for patching. Widespread surface deterioration across the lot is a candidate for mill and overlay. A site evaluation will confirm which approach fits your specific conditions.
US Asphalt performs asphalt milling and overlay for commercial and industrial clients across the Boston metro. Call (855) 246-8867 to discuss your project.
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Are you tired of working with contractors that just don’t fit the bill? Have you experienced terrible workmanship, late contractors, or unfinished jobs and are ready to move onto something better? US Asphalt can eliminate all your worries and leave you with nothing but the perfect paving job and a massive smile. We’re here to take on any of your large commercial projects or residential jobs in Natick, MA and beyond. Give us a call today or fill out our contact form to receive your 100% FREE estimate.