Office and Contract areas generally require hard wearing underlays, which will withstand high use and wheeled traffic. In large contract areas such as cinemas and exhibition centres, carpet rucking and movement can be problematic, in these areas double sticking is becoming increasingly popular. . When double-sticking the underlay is adhered to the sub-floor with a release adhesive and the carpet is bonded to the underlay using a permanent adhesive. See Double-stick section for further information. Underlay Range Area of use Silver LIning Cloud 9 Universal underlay (double stick and stretch fit) for large heavy contact areas. C9 Contract Cloud 9 Universal underlay, double stick and stretch fit, for contract areas (boardrooms). C9 Super Contract Cloud 9 Universal underlay for luxury contract areas (hotel bedrooms) Flame Retardant 6 Cloud 9 Universal underlay for large heavy contract areas with a high flame retardancy specification.