To limit the probability of 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 a floor, 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 movement, vibration or deflection, which could lead to negative effects on the psychological well-being of persons.