safety glass
Hi Pat!
As Laoise has told us It is not mandatory to have rails on glass doors or windows, I think that these are meant to stop people falling down from heights.Safety glass should be sufficient for the ground floor , but it depends how high the ground floor is compared to the ground outside, the house might be build on a slope where one side of the ground floor is level with the foot path but on the other side it could be 3 meters above ground.
Safety glass can be combined with any other glass , low-E, self-cleaning etc.,it is just another type of glass.