Slate
A
slate originates as a sediment usually a fine grained mudstone. Through the
action of burial, compression and heat a mudstone will develop progressively
from a shale, to a slate; to a phyllite; and then with sufficient heat, to
a schist and finally a gneiss. definitive physical characteristic of slate
is it's slatey cleavage which enables the material to be split into parallel
sheets (i.e. roof slates). A riven slate is the result of having two sets
of cleavage intersecting at an angle and creating a wavy cleavage plane. "Riven"
in the stone industry refers to a finish of a stone that has been split along
a natural weakness. Certain English 
green
slates originated as volcanic ash deposits that were deposited in water. The
stone itself does not have a well developed cleavage and is generally massive
Slate is a metamorphosed sedimentary rock well known as high quality roofing
material- a slate roof should last well over 1 00 years. It is also eminently
suitable for many architectural applications and for flooring, fireplaces
and walling. Finishes Natural, Riven, Flamed and Honed. Application External
and internal Flooring & Cladding also Roofing, Coping Stones and Cills.
Performance One of the most durable of natural stones in extreme
atmospheric conditions. Thickness 1Omm. plus. Special Uses Natural Riven Slate
is non-slip even when wet making it excellent for swimming pool surrounds.
Used extensively as copings owing to its low permeability.
References
-
Roo ng B,@- 5534 Pati 1 Code ofpracticefor Slating & Tiling.
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BS- 680 Pati 2 Roofing Slates. Cladding
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B,@- 8928 Code ofpracticefor the Design and Installation ofnatural Stone Cladding. Components
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BS- 5642 Sills & Coping.@.
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