The Ridge Union sits in the gaps between each of the ridge or hip tiles, holding them in place. The union's body slides onto the end of the tile and is flexible so that it bends to the shape of the tile. The next tile slots into the other side of the union and this continues along the full length of the ridge or hip. Once the tiles are all correctly rested in place, the unions are secured by driving the screw assembly; complete with clamp plate and sealing washers, through the hole in the top and into the horizontal batten below. The screws should be tightened down so that the clamp plate presses down on the tile securing it in position.