A drywall is constructed by stacking the bricks on top of each other dry, i.e. without placing grout between the stones. The wall is anchored and supported by continuously putting casting compound behind the stones while stacking. In the case of high altitudes, additional anchorage to the underlying structure must be considered. See how to make a drywall using slate here. See film and installation instructions for how to make a drywall using slate  here