Changes

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*Do not require ground level space, so particularly well suited where ground space is limited or sites with large flat roofs,

*Do not require ground level space, so particularly well suited where ground space is limited or sites with large flat roofs

*May not require additional sewer connections,

*May not require additional sewer connections  

*Easy to retrofit if structural support and waterproofing are adequate,

*Easy to retrofit if structural support and waterproofing are adequate

*Relatively low cost compared to green roofs (no vegetation requirements),

*Relatively low cost compared to green roofs (no vegetation requirements)

*Potential for evaporative cooling and reduction of urban heat island effect.

*Potential for evaporative cooling and reduction of urban heat island effect

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*Must be regularly inspected and maintained,  

*Must be regularly inspected and maintained,  

*Limited application on sloped roofs or sites with small building footprints,

*Limited application on sloped roofs or sites with small building footprints

*Do not provide any co-benefits such as habitat creation or air quality improvements associated with vegetated practices,

*Do not provide any co-benefits such as habitat creation or air quality improvements associated with vegetated practices

*Mechanical systems and other rooftop architectural features must not be adversely impacted by ponded water.

*Mechanical systems and other rooftop architectural features must not be adversely impacted by ponded water

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