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 roofing slates are produced 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.