Insulated plasterboard. The new range of Gyproc ThermaLine laminates provide the perfect way to enhance thermal insulation for both new and existing buildings, whilst fixing in one simple operation. And now the insulated plasterboard range is bigger and better than ever. Available in Gyproc ThermaLine BASIC, PLUS and SUPER. We also stock insulated plasterboard from Knauf, Lafarge and Kingspan. If you are worried about heat retention then the insulated thermal capabilities of this plasterboard will ensure that heat is retained.