One of the most important aspects of a successful asphalt paving project is the thickness of the asphalt itself. It doesn't matter how great the base is, if the asphalt is laid at an insufficient thickness the parking lot likely won't last much longer than 10 years. There are many standards for thickness depending on what the expected use of the paved surface is.
The thickness of the asphalt can either be stated as pre-comapction or post-compaction, it can be hard to know which is being used on a quote. Most engineering plans will call for a specified post-compaction thickness, if the contract is written to provide work based on an engineered specification then most likey the quoted thicknesses will be in post-compaction to match the specifications provided. However, more often than not when a specification is not provided, the contractor will provide the quote in pre-compaction thicknesses, this is done for a variety of reasons:
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