To limit the probability of an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], which could lead to the inadequate control of relative humidity, which could lead to condensation.
This is to limit the probability of deterioration, which could lead to compromised structural integrity, which could lead to harm to persons.
To limit the application of Sentence 9.33.1.1.(1) so as to exclude residential buildings that are not occupied in the winter.