◄Back

# Long description

This figure has two parts. At the left part ‘a’ shows two people in a room holding up a sheet of plasterboard with a foam backing. It is to be glued to the wall surface. The wall has a window in it and the foam-backed plasterboard has a cut-out to accommodate the shape of the window. At the right part ‘b’ of the figure shows a photograph of the interior surface of a wall containing a window. It shows that insulated battens approximately 30 millimetres thick have been screwed to the wall. A layer of brown rockwool insulation has been fitted between them. Finally at the right a layer of plasterboard is shown screwed to the insulation over the battens. The battens and insulation are carefully shaped to fit the window opening.