Van Hise Rock was named for the preeminent geologist of the 19th century, Charles Richard VanHise, who was also president of the University of Wisconsin-Madison from 1903-1918. VanHise used this rock to show the major structural features of metamorphic* Precambrian* rock and also to demonstrate the kinds of changes that occur in rocks through mountain building periods.
The requirement for seat height, however, is very simple: The top of the seat must be a minimum of 17 inches and a maximum of 19 inches above the shower floor.
The International Residential Code requires shower stalls in homes to measure a minimum of 30 inches by 30 inches. Keep in mind that this is clear space minus any seats or obstructions -- so if you add a 15-inch-deep seat, your shower must measure at least 45 inches deep by 30 inches wide.or those who use wheelchairs and plan to roll into the shower, allow for minimum space of 30 inches by 60 inches within the shower, plus a 30-inch-by-60-inch clear space in front of the shower to maneuver.