Permo® air has been used by Morrish Builders on 70 new homes at Tregunnel Hill, near Newquay. Due to the NHBC’s endorsement of air-open underlays without supporting high level ventilation Permo air will ventilate roofs effectively while maintaining an uninterrupted roof line. The development for the Duchy of Cornwall is on the edge of the town centre and has provided a variety of homes, building upon previous work at Poundbury. It reflects a best practice approach to urban design using traditional local materials and those which present low environmental impact. Tregunnel Hill is the latest high profile project in which Permo air has been specified, with others ranging from listed buildings to contemporary commercial and residential developments.