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| Liquid-applied waterproofing systems | |||
| Specification options | Capital cost £/m² | Net present value for 60 years | Service life years |
| Modified bitumen | |||
| Liquid modified bituminous system, minimum 3 mm thick, surface reflective coat | 40 | 141 | Oct-20 |
| Inverted roof: hot applied bitumen liquid membrane in two coats minimum 6 mm thick with reinforcement, protective sheet, insulation board, separation layer and 50 mm thick concrete paving slabs | 131 | 131 | 60 |
| Polyester-based system | |||
| Polyester-based system, minimum 1.5 mm thick applied in two layers with pigmented top coat. Third-party assurance for 20 years’ life expectancy | 42 | 116 | 20 |
| Polyester-based system, minimum 1.5 mm thick applied in two layers with pigmented top coat. Third-party assurance for 25 years’ life expectancy | 48 | 113 | 25 |
| Polyurethane-based system | |||
| Polyurethane-based system, minimum 1.4 mm thick two layers. Third party assurance for 15 years’ life expectancy | 40 | 131 | 15 |
| Polyurethane based system, minimum 2 mm thick, three layers. Third party assurance for 25 years’ life expectancy | 50 | 114 | 25 |
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