Open University Project Overview From the new headquarters of The Open University in Belfast, the BT building can be clearly seen. This roof top terrace decked with Deck25 Dark Brown, overlooks the multi million pound Victoria Square Shopping Centre and has views of Belfast City Hall and Belfast's Financial District. More Info As the University is a public building, the decking material had to have high slip resistant value both in dry and wet conditions. Deck25 composite decking was the perfect choice. Equally important were aesthetics and colour. The low maintenace nature of Deck25 represents substantial cost savings by eliminating yearly painting or treating.