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PICP ON SLOPES
For slopes exceeding 5%, use geomembrane check dams to control down slope flows, distribute infiltration over the entire length of the slope and prevent surges from exiting the pavement system at the bottom of the slope.
Surface Water Flows through the No. 8, 89 or 9 stone jointing material between the pavers
Maximum Slope = 12%
Permeable Pavers
Impermeable Membrane (extends minimum 300mm (12”) back behind vertical section) Permeable Subgrade. Prepare according to recommendations in geotechnical report
Bedding Layer 2” ASTM No. 8 Stone
Base Layer 4” ASTM No. 57 Stone Subbase Layer Minimum 6” ASTM No. 2 Stone Optional Geotextile Separation Fabric on bottom and sides of open graded base
Maximum Storage Volume
Orifice Opening in Membrane
Bleed Hole in Membrane
Because conventional pavement bases and subbases are not designed for saturation, they require protection from water infiltration. Separate the two pavement systems with an impermeable barrier (geomembrane or concrete). Also consider sloping the PICP sub-grade away from the adjacent conventional pavements or installing under-drains at the interface. TRANSITIONS TO IMPERVIOUS SURFACES
200mm to 600mm (8” to 24”) wide rebar reinforced concrete header curb (designed by others). Elevation to be 6mm (1/4”) below adjacent pavers and asphalt. Set depth to subgrade.
Jointing Material to bottom of chamfer Concrete Pavers
Saw cut pavement and seal joint
Maintain typical joint width adjacent to curb
Bedding Layer
Base Layer Subbase Layer
Existing asphalt pavement Compacted aggregate base
Optional geotextile around base and subbase
Soil Subgrade
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