ABSTRACT
Natural stone can be grouped into three classes: Igneous rock is formed when molten rock cools and hardens. In general, natural stone performs very well across a range of categories in which it is included in the Green Guide; in fact, nearly half of all stone related components achieve an A or A+ rating, with the majority being rated C or above. However, and despite the potential green credentials of the source material, perhaps surprisingly, when used for paving, natural stone score as highly as a number of alternatives. The material cost and supply can account for up to half the cost of a natural stone streetscape contract. Three European Standards specify the performance requirements and the corresponding test methods for slabs, setts, and kerbs: Together, these standards cover most of the common elements of natural stone surfacing used in UK streetscape contracts.
