How long con you expect an asphalt road to last before needing overlay?

Does sealing significantly delay need for overlay? If so how often should it be repeated?

Answers:

From: DeWayne Heintz

The FHWA is currently conducting research to answer this question

From: www.drivesdirectltd.co.uk

Yes, sealing does increase the surface life. It creates an bituminous membrance, thus preventing further oxidation and plucking. Check out our website for more details.

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