Paving

Resurfacing – Overlay of the Existing Pavement and Installing New Asphalt

An overlay is generally 2 inches of new asphalt paved over the existing asphalt. Typically, a ½ inch scratch leveling course is paved, as necessary, to level out the parking lot and then a 1 ½ inch surface course is paved over the scratch leveling course. When deciding to overlay in lieu of grinding the parking lot, Surface Engineering will consider the following: curb reveal – do you have enough curb reveal to overlay the parking lot and still have curb reveal remaining when paving is completed?; condition of pavement – is the pavement fractured but solid and strong or is it broken and falling apart?; condition of the sub base – is the parking lot able to handle the weight of a grinder or will it cause further damage to grind?; budget – an overlay is more budget friendly than grinding and may be a better and more viable option if pavement conditions are ideal.

Resurfacing – Grinding the Existing Pavement and Installing New Asphalt

Grinding or Milling Existing pavement down, generally 2-4 inches, is an impressive resurfacing option. Grinding a parking lot before paving new asphalt eliminates reflective cracking and allows for the entire parking lot to be leveled before the surface course of asphalt is paved. Grinding a parking lot offers an opportunity to inspect the aggregate base and re-grade if necessary. When grinding, it also makes sense to analyze existing drainage and install new drainage where necessary. When deciding to grind in lieu of overlaying a parking lot, Surface Engineering will consider the following: curb reveal – when curb reveal is minimal or non-existent milling may be required to achieve or maintain proper curb reveal; condition of pavement – when the pavement is busted up or falling apart grinding may be the only option as an overlay will not be effective; condition of the sub base – is the parking lot able to handle the weight of a grinder or will it cause further damage to grind? is the base soft and require undercutting?