26 Permeable or open grid paving consists of standard concrete blocks, which have a large percentage of the surface area that is open or penetrable. The open area allows for water to penetrate the paving as opposed to normal paving (clay, concrete asphalt), which assists water running off the paving into stormwater systems. UNSEALED/OPEN PAVEMENT Unsealed roads are those that have not been sealed with a surface treatment, like rolled asphalt or chip seal, even though they have been constructed. These usually consist of gravel roads with loose aggregates that have not been sealed in with surface treatment. In terms of appearance, a sealed parking lot will look brand new since the coating provides a dark black finish to refresh the pavement.
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