In small buildings, I usually come across with half basements or less than half basements. For example, in a 3-storey 300 m2 floor structure on 2 flats, we only go down to 40 m2 for the garage. When my problem is solving the garage with curtains and entering as a buried floor (sd:normal R:4) The r coefficient is as fractional as 3.75. Rather than my problem, how would it be best to enter information in such structures. I await your help, thank you...