Clay
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Types and Durability
| Description
Clay |
Expected Lifespan
(Years) |
Adjustment Factors |
| Shingle, side-locking and head-and-side locking tilesmanufactured to SS 70: 2001 although size may vary. Minimum tranverse strength to be 890N, water absorption not exceed 10.0%. | 50+ | 1st stage adjustment factor:
In industrial areas (heavy polluted): -15% years In urban areas: -10% years In suburban areas: -0% years 2nd stage adjustment factor: Within 20m from express way: -20% years Within 20m from major arterial road: -10% years Within 20m from light traffic road: – 5% years Test certificate from approved local testing authority : +15% years |
| Hand or Machine made clay plain tiles or pantilesmanufactured from well weathered or well prepared clay or marl in accordance with BS 402: 1990. Standard size 265 x 165 mm and not less than 10mm thick or more than 15mm thick. Minimum tranverse strength to be 778N, water absorption not exceed 10.5%. | 35+ | |
| Hand or machine made clay tiles not complying with BS 402 or SS 70. Performance to be comparable to BS 402 or SS70 requirements. | 35 | |
| Single lap clay pantiles with interlocking grooves on two sides only or on all four edges. Not to BS 402 or SS 70. | < 10 | None |
| Machine or hand made plain tiles not complying wiht the requirements of BS 402: 1990 in terms of water absorption, transverse strengths and/ or frost testing. | < 10 | None |
Combination of adjustment factor (1st stage and 2nd stage) should be added to obtain the durability values. Refer to durability calculator.
Assumption: Plain tiles have either two nibs or one continous nibs as recommended by BS 402: 1990.
If aluminium or stainless steel or copper fixings are used, adjustment factors are provided for ferrous fixings:
- Unprotected/ unplated ferrous fixings: -30% years
- Galvanized or electroplated ferrous fixings: – 15% years
Every tiles fixed in accordance with BS 5534: Part 1.