Polystryrene
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Types and Durability
| Description
Polystyrene |
Expected Lifespan
(Years) |
Adjustment Factors |
| Extruded polystyrene to BS 3837 Part 2. Designed for proposed use | 35 | Test certificate from approved local testing authority : +5% years |
| Expanded polystyrene to BS 3837 Part 1. Designed for proposed use | 35 | |
| Polystyrene not to BS 5803 Part 1 and/ or not designed for proposed use | < 10 | None |
Note: Installation to BS 5803 Part 3
For more details, refer to Roof Insulation Requirement