An overlay, as its name implies, is simply a new pavement section (generally 1.5″ – 2″ thick) placed over the top of an existing pavement surface. It is also common in many parts of the country to use a fabric interlayer (Petromat, GlasGrid, GlasPave) before applying the new asphalt. In addition to helping act as a moisture barrier, fabric interlayers help reduce reflective cracking from the original surface into the new overlay. With the proper application, an overlay can build on what you’ve already invested in your road or parking lot and can extend the functional life of the pavement surface by 15 years or more.
When to Do an Overlay
Typically overlays are done in Stage 4 or 5 of the pavement’s life cycle.
Watch the video below to see a real live overlay in action.