How much underlayment is required to support the pavers and is this system applicable for a street that probably has utilities and vaults located in its substrate?
Design for detention is usually performed first, then compared with structural design and evaluated for long-term performance taking into consideration soils and design life factors. In this scenario, we don’t believe the detention requirements in the City of Chicago would require a design to accommodate a 100 year storm, but a 24″ sub-base would meet a 24-hour, 100 year storm. A factor that the city may be interested in is that the pavers could be removed and replaced in the event access is required for these utilities and vaults.
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