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             Application and method  | 
          Application
             Estimated installed cost  | 
          
             Estimated installed cost  | 
          
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             S A Rand  | 
          
             US Dollars  |  
          
             unit  | 
 
        
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             Hyson Cells sandwiched layer  | 
          
             R125  | 
          
             to  | 
          
             R150  | 
          
             $21  | 
          
             to  | 
          
             $25  | 
          
             / m²  | 
        
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             100% waterproof. Walls up to 700. Base CBR 
            >15  | 
          
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             First layer 7.5 MPa concrete in cells 75 mm 
            deep.  | 
          
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             Middle layer 4 mm bituminous or 1 mm plastic 
            sheet  | 
          
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             Final layer 20 to 40 MPa concrete in cells 75 mm 
            deep.  | 
          
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             Heavy duty plastic liners on protecting 
            layer  | 
          
             R400  | 
          
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             $67  | 
          
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             / m²  | 
        
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             Base compaction 92%. CBR > 45  | 
          
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             Multi protection layer on top.  | 
          
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             Restricted access of heavy vehicles.  | 
          
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             Walls must not exceed 45°  | 
          
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