If the conservatory is to stand on a cast concrete slab, some form of protection, for example vapour-retardant lining paper, must be laid . Kiinnitä reunus palkkeihin terassiruuveilla 4,2x45. Lay the internal ribs 18x115 or 18x200 in place along the sides. Do not screw them in place at this stage. 11. J. K q: 4.2x42. J. K. 3+3.