Fire paths -- Precast concrete units -- Plastic units -- Sub-bases for grass concrete -- Bedding and filling grass concrete precast blocks -- 3.8 Pedestrian deterrent paving -- Advantages -- Disadvantages -- Deterrent paving units -- 4. Granular paving -- Bases and sub-bases -- Geotextiles and filter fabrics -- Drainage of granular surfaces -- 4.1 Gravel materials -- Gravel -- Self-binding gravels -- 4.2 Ballast, hoggin and shale -- Ballast -- Hoggin -- Shale or blaes -- 4.3 Bark and woodchips -- 5. Kerbs and edgings -- 5.1 Kerbs -- Kerbs to British Standard 7263: Parts 1 and 2 -- Natural stone kerbs to British Standard 435 -- Laying and bedding kerbs -- 5.2 Edgings -- Brick edgings -- Proprietary edge restraints -- Foundations, bedding and jointing -- Junctions -- 5.3 Mowing stones -- 5.4 Tree grilles -- Precast concrete grilles -- Cast iron grilles -- Hardwood grilles -- ln-situ grilles -- Bases and bedding -- Amsterdam Tree Soil planting -- 6. Drainage of paved areas -- 6.1 Channels -- Precast concrete channels -- Natural stone channels -- Brick channels -- Granite or concrete setts -- Patent channels -- Foundations, bedding and jointing -- Manhole and access covers -- 6.2 Surface water drainage -- Design of drainage falls and channels for paved areas -- Calculation of paving drainage -- Pipeline materials -- Bedding of pipes generally -- Backfilling trenches for flexible pipes -- Gulleys and access points -- Disposal of surface water -- Outfalls to watercourses -- 6.3 Land drainage -- Land drainage of sub-strate -- Catchwater drains -- Mole drainage -- Sand slitting -- Soakaways -- 7. Special paving -- 7.1 Design for the disabled -- Wheelchairs -- Car parking for disabled drivers -- Paths -- Barriers and crossings -- Ramps and steps -- 7.2 Playgrounds and sports areas -- Hard porous surfaces -- Playgrounds -- Training areas -- 7.3 Sunk paths