Westmorland slate is a natural slate, a hundred times older than mankind and a material that has been quarried for over 400 years to create stunning and weathertight roof coverings.
Westmorland Green slate provides an exquisite finish to any home, new or refurbished. It is quintessentially British and speaks permanence, consideration and quality. The perfect medium for creating fascinating and striking roofscapes of distinction. The distinctive green colour is created from the metamorphosed volcanic ash of the Borrowdale Volcanic group of mountains in the heart of the Lake District. These deposits contain chlorides which impart a beautiful green colour.
We produce Westmorland Green roofing slates in three different formats.The three roofing slates formats are:
Patterns – are cut to fixed dimensions of length and width: the width never being less than half the length. Where a roof has a shallower pitch, larger sizes of pattered slates can be used.
Sized Slates – are of a stated length but of random widths: the widths will never be less than half the length and not greater than a square.
Sized slates are ideal for roofs, where there is a lot of cutting required, i.e. at verges, hips and valleys, as the widest of the slates can be selected for these areas.
Randoms – are supplied in random lengths and widths: the width never being less than half the length.
Randoms are ordered by reference to the maximum and minimum required lengths, for example 460mm to 225mm (18” to 10”): they must be sorted on site by length and are laid to courses which diminish from eaves to ridge.
Most size options are available in different thickness / selection grades – Bests, Strongs and Extra Strongs.
Westmorland slate is fully tested to BSEN12326-1:2004 and attains A1, T1 & S1 certification.