Microsurface

Microsurface is a thin cold-mix coat of polymer-modified asphalt emulsion, crushed stone fines, cement or lime filler, water, and a few additives. Crews spread it about 3/8 inch thick over worn asphalt to seal it and add grip. It cures fast, and traffic is usually back on it inside an hour. The rock in the mix is small. All of it passes a 3/8-inch screen, so the finished surface is tight and closed.

The "micro" in the name means the coat goes down thin, not that the stones are unusually small. ISSA A143 is the spec that governs it, and it sets three stone gradations. Type I is the finest for light fill work. Type II is the standard surface seal on roads and lots. Type III is coarser and can fill minor ruts. Microsurface is a paving contractor job. You don't buy it by the yard, and we don't stock it. If you're after driveway rock or road base, the links below cover what we deliver.