The Penrhyn Heather Blue slate, also known as Bangor Blue, is one of the most widely used slates. The Penrhyn quarry has been producing roofing slate since the 13th century, and is regarded as being the best in the world. Welsh slate is extracted from some of the world’s finest deposits, formed up to 590 million years ago. Of that extracted only less than 10% is used. They are renowned for the consistency of their colour and texture.

Penrhyn quarry has been mining slate since the 13th century and is regarded as generating the world’s highest grade slate. The original sediments that formed the slate at Penrhyn were exceptionally pure, with no damaging pyrites which can be found in sub-standard slates.

The Penrhyn Heather Blue slate, aka Bangor Blue, has a heather blue or purple colour and achieves the highest grade in the British Standards (BS) EN 12326 – 1:2014 standards W1, T1, S1, A1 and receives the highest S1 grade from the American Society for Testing and Materials (ASTM).

Penrhyn Quarry has been at the centre and the focal point for UK natural stone and its heritage since the thirteenth-century and a major operation for over 400 years. Penrhyn is the largest slate producing quarry in the World.

After 100 years of use, the quality of Welsh slate is such that typically 50% of it is re-used. There is no other roofing material which has demonstrated this exceptional durability. Penrhyn Heather Blue slate achieves the highest grade in the British Standards (BS) EN 12326 – 1:2014 standards W1, T1, S1, A1 plus receives the highest S1 grade from the American Society for Testing and Materials (ASTM).

Award-winning projects

Take a look at our projects below, including the following award-winning projects:

Master Roof Tilers and Slaters 2017 Best Extension, Re-Roofing etc. Award for Victoria Cottage
Master Builders Association 2014 Restoration of a Historical Building Award for the replacement and maintenance of Maitland Courthouse, NSW