Wall furring channels, which use adhesive dabs and metal pipes to fix plasterboards directly to masonry backgrounds, including boards with an integrated vapour control layer and insulated plasterboards, provide a solution for fixing plasterboards directly to masonry backgrounds. This means that high levels of energy efficiency can be achieved by improving the output of existing walls. Services may be incorporated without chasing the masonry substrate. A wide range of U-values can be achieved using the wide range of insulated plasterboards required to meet project requirements. Allows for the removal of minor surface irregularities produced by the adhesive dabs within the drylining cavity.