Cellulose-fibre insulation: from mid-19th century to modern-day Passivhaus standards. Using plant fibres as insulation has a long history, but the industrial process of recycling newspaper to make cellulose insulation goes back to the 1950s.

Retrovive was developed from a conviction that old houses don’t have to be cold and inefficient. Now a great success story, Retrovive has made many hundreds of customers warmer and more comfortable over the years.