Indigenous stone : Slate solutions

The new £15million Central Library in Cardiff forms a centrepiece to the city’s £675million St David’s 2 development. The project aims to revitalise the city and inject new life into the Welsh capital but must also uphold Cardiff’s rich heritage. Hence the dark blue/grey slate from Welsh//Slate’s Cwt-y-Bugail quarry chosen by St David’s Partnership – the developers behind St David’s 2 – and their architects, Building Design Partnership for the flooring and steps in the library’s 320m2 reception area.
The stone was laid by Vetter UK (a subsidiary of main contractors Laing O’Rourke). They used 250mm x 500mm hand split, riven Welsh//Slate tiles with a nominal 20mm thickness. Underfloor heating has been incorporated into 75-100mm thick screed that has an SBR47 additive to improve adhesion.
At Time Central in Newcastle, Cumbrian slate company Kirkstone supplied 20mm Silver Green slate as 253m2 of honed tiles and 98m2 of sanded tiles. Two widths of honed tiles were coursed on two floors with the sanded tiles laid to give improved anti-slip in front of lift doors and stairways. The sanded tiles were also used to give a visual feature at the perimeter of the floors and in a curved band running through the floors.
There were also 66m of honed treads and risers and, externally, 400m2 of Silver Green paving was laid and 233m2 of honed cladding in a 500 x 500mm format were used to tile round the diminishing  ramp wall up to a colonnade.
The architects were Lister Associates, the main contractors Tolent and the stone sub contractor
P Plunkett Tiling.
Some of the Burlington's Brandy Crag silver/grey stone from Cumbria was used for flooring and 50mm cladding with a 5mm staggered face at the new British Land corporate offices of York House in Seymour Street, London. There were 850m2 used for flooring and nearly 400m2 for cladding.
The architects were EPR Architects Ltd, London, the main contractors Bovis Lend Lease, the flooring contractors
W B Simpson and the cladding contractors Marmi Ltd.
www.welshslate.com
www.kirkstone.com
www.burlingtonstone.com