Penrhyn 'Bangor Blue'®

Penrhyn Bangor Blue Slates are regarded as the best quality roofing slates in the world.

They are quarried at the Penrhyn Quarry in Bethesda, North Wales at the edge of Snowdonia National Park, from a slate deposit that was formed in the Cambrian era (600 million years ago).  As such, they are an extremely pure, hard and dense slate.  Penrhyn slates are recognizable from their distinctive heather blue / purple colour, and textured grain.  They are one of the only roofing slates in the world which do not contain any potentially damaging inclusions or iron pyrites. 

Penrhyn Bangor Blue slates cover many of the world’s most prestigious buildings including Buckingham Palace and the British Museum in London.  They are popular on a wide variety of buildings from bespoke architectural homes, to historical buildings (such as Victorian and Georgian period properties), to Churches, Cathedrals, Castles and Museums.

These slates truly do have a global world-wide appeal and are still as popular in many countries around the world (France, Germany, Holland, Belgium, North America, Australia and New Zealand), as they are in the home markets of Ireland and Britain.

Bangor Blue slates come in standard sizes of 500x300mm (20 x 12”)- note other sizes are available on request, and in 3 thicknesses:

  • Capital Grade (5.5mm Nominal Thickness)
  • County Grade (7.5mm Nominal Thickness)
  • Celtic Grade   (9.5mm Nominal Thickness)

Penrhyn 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).

Watch a short video of our Bangor Blue slate fitted here

Product Detail

Palladian Style Home Cultra Co Down

Bangor Blue Modern House

Described as 'Irish Palladian' in style this gorgeous house in Cultra Co Down is slated with Bangor Blue 500x300 slates.  The owners of the house Colin and Barbara Barry always wanted to build their o…

View Case Study
Colour and Finish 'Heather Blue' Riven Textured
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 (std) All LBS slates are holed for 100mm head-lap
Alternative Headlap 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) 62.75 48.80 38.35
Slates per sqm at 100mm h/lap 16.6 16.6 16.6

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