This Cheshire company makes and distributes ventilation and specialist building products, such as protective membranes used in roofing and timber-framed buildings. In order to reduce its dependency on the construction sector in Britain and Ireland, the company opened offices in France and Germany to sell across Europe, which helped overseas sales reach £2.9m in 2014. The business also established a manufacturing facility in South Africa in 2013, adding to operations in Derbyshire and South Wales. Joint managing directors Graham Dronfield, 51, and Neil Rideout, 53, head the group.