Knauf Aquapanel Interior, the specially developed tile backing board from Knauf Drywall, has eliminated tiling defects for a leading South West housebuilder and developer over the past five years, during which it has built nearly 600 dwellings. Torquay-based Cavanna Homes first used Aquapanel five years ago at Kernow Gate, a development of 35 houses in Launceston, and has used it ever since.<br> <br> <br> "We used to specify tiles on plasterboard for showers and bath surrounds but when tiled walls are subjected to heavy splashing – as in a shower – the slightest defect in tiling can damage the bond between tile and board, or the plasterboard itself," says commercial manager Mike Bennett. "Since we started using Aquapanel Interior we haven't had any callbacks for this problem at all – and we average around 140 units a year."<br> <br> <br> Cavanna has developed a standard approach in which the glass Abre reinforced cement board is installed so that it lips over the top of the shower tray on the walls so there is no way that any water can get behind it.<br> <br>