rigid basement floor number changes according to what and what does it mean. It is taken as a different value when there is no basement.. a different value is taken when there is a basement floor. What are the factors that change this value? can anyone help? I wonder.. For example, in a building consisting of basement, ground and normal floors, if a part of the basement floor is turned with curtains, what is the rigid basement floor number to be taken here.. And in the same way, if there is no curtain in the basement, will the same value be taken or does this value change? /quote] I think the subject is understood, but you can also check the attached link if you want.