The Cwt-y-Bugail quarry in North Wales has been producing quality dark blue grey roofing slates from 1840. Located East of Blaenau Ffestiniog in the Snowdonia National Park, it is the highest industrial site in the UK and although the site is now an open cast quarry, slates were originally mined in deep caverns and pillars. In fact, during World War II, many of Britain’s most valuable paintings and national treasures were stored deep inside the slate caverns for safe keeping!
Referred to in Ireland as 'Portmaddog Slates' (after the port from which they were shipped) the dark blue grey slates produced by this quarry have a “riven” texture and are famous, not only for their use as a roofing slate, but also as an architectural building material. Although quite different in colour to the Bangor Blue slate, they share the quality and durability with which Welsh Slate is synonymous.
Cwt-y-Bugail slates come in standard sizes of 500x250mm (20 x 10”), and in 3 thicknesses:
Cwt-y-Bugail roofing slates conform to BS 12326-1:2014 (W1, S1, T1), hold BS Kitemark accreditation and are generally expected to outlive the life of a building (when fixed in accordance with BS 5534 / S.R. 82:2017).
This is one of the most unusual and visually striking Irish building restorations that LBS have supplied. The Old Head of Kinsale Signal House on the Cork coast has, in 2015, been reborn as a Museum a…View Case Study
|Colour and Finish||Blue Grey|
|Available in Sizes||500 x 300mm (Other Sizes on request)|
|Available in Grades||Celtic, County and Capital|
|Nominal Thickness||Celtic 9.5mm, County 7.5mm, Capital 5.5mm|
|Minimum PItch||22.5 deg for standard 100mm h/lap *normal exposure only*(for pitches below 22.5 deg please consult LBS Technical Dept)|
|Maximum Headlap||All LBS slates are holed for 100mm head-lap|
|Alternative Headlaps||For availability and advice please contact LBS|
|Gauge||200mm for slate pre-holed for 100mm head-lap|
|Batten Size||Please refer to BS 5534 or SR 82:2017|
|Nails||Copper, Aluminium or Silicon Bronze|
|Slate Dimensions/ Grade||500x300mm Celtic Grade||500x300mm County Grade||500x300mm Capital Grade|
|Weight per sqm Laid (kg)||53.62||46.98||37.01|
|Slates per sqm at 100mm h/lap||16.6||16.6||16.6|
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