We used the Harvard-model, the first high density storage facility of its kind within the UK. We clad the building in bespoke, 4 hour fire rated, insulated concrete sandwich panels. These provide high thermal mass, tightly regulating the internal temperature and humidity. For the external face of these panels, we designed a unique cast in motif which represents the millions of stacked books within. By incorporating a timber screen to mark the entrance we have brought warmth and human scale to the building.