Expanded/Extruded Polysterence
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Types and Durability
| Description
Polystyrene |
Expected Lifespan
(Years) |
Adjustment Factors |
| Extruded polystyrene, materials to ASTM C 578: 2001 or to BS 3837 Part 2 | 35 | For invered roof system or in protected membrane system: -15% years
Test certificate from approved local testing authority : +15% years |
| Expanded polystyrene, materials to ASTM C 578: 2001 to BS 3837 Part 1 | 35 | |
| Extruded or expanded polystyrene, density/ strength not specified or not to BS 5803 Part 1 and 2 | < 10 | None |