Marble
Types and Durability
| Description
Marble (Metamorphic stones) |
Expected Lifespan
(Years) |
Adjustment Factors |
| General | ||
| Natural Marble specified under Group A. Performance and specification to be confirmed with supplier. | 35+ | 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: Contact with soluble salt: -30% years Within 20m from express way: -20% years Within 20m from major arterial road: -10% years Within 20m from light traffic road: – 5% years Quality relies on preservative or water repellent: -15% years Test certificate from approved local testing authority : +15% years |
| Natural Marble specified under Group B. Performance and specification to be confirmed with supplier. | 35+ | |
| Natural Marble specified under Group C. Performance and specification to be confirmed with supplier. | 35+ | |
| Natural Marble specified under Group D. Performance and specification to be confirmed with supplier. | 35+ | |
| Uninsured, i.e. natural marble neither specified nor in above groups | < 35 | None |
Combination of adjustment factors (1st stage and 2nd stage) should be added to obtain the durability values. Refer to durability calculator.
Note: Marble Institute of America (MIA) has classified marble into 4 groups. The basis of this classification is the characteristics encountered in fabricating and has no reference whatsoever to comparative merit or value.
Group A: Sound marbles with uniform and favourable working qualities.
Group B: Consist of marble similar to group A but with less favourable working properties.
They have occasional natural faults, and a limited amount of repair is needed.
Group C: Marbles with uncertain variations in working quantities.
They contain flaws, voids, veins, and lines of separations and always require
repairing.
Group D: Similar to Group C, but with a larger proportion of natural variations and with
maximum variation in working qualities.