The slate-roofed buildings take up 18.09% out of 6,836,352 buildings in total.
The area of slate-roofed buildings takes up 7.39% of the total building area.
The thickness of scattered slate by age is (−0.015 + 0.034 × n) mm.
The amount of asbestos discharged per unit area of slate is (−2.5 + 5.67 × n) g/m2.