No school stands empty. As kids and teachers, administrators, and maintenance staffs use their schools, they will, by the inherent nature of being human, abuse their schools. Planning ahead can substantially decrease the effects of that abuse and prolong a school's life expectancy. Don't use absorptive materials on any surface in restrooms. Kids don't use a bathroom and leave.
Water fights break out.
Toilet paper gets wet and thrown at the ceiling. Toilets get deliberately clogged and overflow. Absorptive materials absorb odors and waste as well as water. Plaster, concrete, dry wall, acoustic tile and wood are highly unsanitary materials to use in restrooms. 2.Ceramic tile, glazed concrete tile, or properly sealed terrazzo are good alternatives to absorptive materials.