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Specification options: green roofsCapital costNet present value for 60 years
Extensive green roofs  
Sedum mat pre-grown 20-30mm substrate4555
Sedum pre-grown plug planting 75mm substrate3342
Intensive green roofs  
Semi-intensive grass, herbaceous plants, 120–200mm substrate3044
Intensive low-lying shrubs and coppices, 150–250mm substrate3551