The axis of the rafter distribution has to be 90 cm. The angle of inclination of the roof that can be built form it is determined by the tile overlapping (which should still provide appropriate protection against precipitation) and the kind of the tile (which can be used without extra fixing. With the tiles on the market, we recommend the construction of roofs of 22-45°, considering the the batten gauge of 33-34 cm. Around the chimney, when stiing the exit opening and the dormer windows, a wooden frame, matching the size of the opening, has to be placed. The roof elements always have to be placed progressing from the eaves towards the arris and on the weather face. The tiles have to be placed on the roof elements in a way that the water and damp channels running through the element are positioned in the middle or by the edge of the tile.