1. For installation directly onto sand base:
1.1 Perth: Crossovers/Carparks/Light Traffic/Patios
1.1.1 Where sub base is possibly unstable or ‘reactive clay site’, obtain a hydrological survey or Civil Engineering survey (Ref AS3727.1 Table 1.5 Site Classification)
1.1.2 Where stability of sub surface is acceptable as CLASS A, and for “pedestrians and commercial vehicles”: fill and compact a permeable basecourse of minimum 100 mm depth (+/-10mm) of ‘6mm aggregate’, or ’10mm aggregate’, or ‘road base’. Where clay is present (Class M site) and traffic expected is commercial vehicles the basecourse should be 150mm depth (Ref AS3727 Table 6.2)
Note for light residential areas with sandy soil (ie most of Perth!) for paths, pool surrounds, light traffic areas: Fast Flow Pavers can be laid directly onto the bedding sand, as per any standard paving. ie without an aggregate base course.
1.1.3 Then lay a non-woven permeable geotextile cloth layer. This prevents bedding sand being lost into the coarse base material. (Ref AS3727, 6.3.1 Note 2)
1.1.4 Then lay a 25mm (min 20mm, max 40mm) bedding layer of paving sand or cracker dust and screed and compact, to form a layer that the pavers can be laid on. Note: Fast Flow Pavers thickness of 55mm is standard, therefore this final layer must be 55mm below required level.
1.1.5 Lay the Fast Flow Pavers!
Usual paving guidelines apply: (Ref AS3727, 6.4 and 6.5)
- Herringbone pattern to be used for commercial vehicles , and basket weave or stretcher bond for light vehicles or pedestrian
- whole pavers at edges
- butt up to the nibs
- use stringlines as required
- cut as required with a diamond wet saw blade
1.1.6 Jointing sand can be any sand or cracker dust as required: wash and or brush into the nibbed gaps.
1.1.7 Edge restraint installation: using concrete to support edges where the paving is likely to subside or be pushed outwards. (Ref : AS3727.1, 6.8 and Appendix D )
1.1.8 Final compaction with a plate compactor covered by carpet or rubber matting.
1.2 Perth: Heavy Traffic/Public Areas/Access for Emergency Services Vehicles/Roundabouts/Carparks for Heavy Vehicles/etc
1.2.1 Ensure sub base is stable: obtain Civil Engineering report.
1.2.2 Fill and compact with an aggregate type and bedding thickness required by Engineer, and compact.
1.2.3 Lay as per above, from 1.1.3 onwards.
2. For Installation to collect the water
2.1 Perth: Crossovers/Carparks/Light Traffic/Patios
2.1.1 Carry out step 1.1.1 above, and before installing the permeable basecourse (as per 1.1.2 above), install an impermeable membrane and drainage pipe draining to a sump, as per the graphic below (Based on CMAA, PE01, P17)
2.1.2 Carry out steps 1.1.3 to 1.1.8 above.
2.2 Perth: Heavy Traffic/Public Areas/Access for Emergency Services Vehicles/Roundabouts/Carparks for Heavy Vehicles/etc
2.2.1 Ensure sub base is stable: obtain Civil Engineering rep
2.2.2 Install edge restraint as required by the Civil Engineering report.
2.2.3 Install an impermeable membrane and drainage pipe draining to a sump, as detailed by the Engineer.
2.2.3 Fill and compact with an aggregate type and bedding thickness required by Engineer, and compact.
2.2.4 Lay as per above, from 1.1.3 onwards.
Properties of pavers are detailed in:
- AS4455.2-2010 Masonry Units Pavers, Flags, and segmental retaining wall units
Sub base and compaction of all surfaces under paving is described in:
- AS 3727-1993 Guide to Residential Pavements
- Council Specifications such as: Main Roads WA Specification 505, City of Swan Specification 254
- Main Roads WA Specification 505 Segmental Paving
Permeable paving and sub base requirements are given in:
- City of Gold Coast, Policy 11, section 13.11 under: Water Sensitive Urban Design Guidelines
- Think Brick Australia Technical Manual 1: Clay Paving Manual
- CMAA PE01: Requirements for concrete pavers sub base which also applies to Fast Flow Pavers TM
Example: Display Unit Pics:
50mm layer of 6mm aggregate tamped and covered by geotextile:
Tamped sand over the geotextile:
Paver height determined:
Pavers cut and laid, mixed to show various sizes and colours:
White fine sand brushed and washed into gaps: