To limit the probability of inadequate clearance, which could lead to an inability to accommodate dimensional changes due to variations in moisture content, which could lead to jamming of sheet edges, which could lead to buckling of cladding.
For exterior floors or environmental separators supporting such floors, this is to limit the probability of the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to compromised structural integrity, which could lead to excessive vibration or deflection, which could lead to persons losing their balance, tripping or falling, which could lead to harm to persons.