Surfaces
The calculation method for the 2012 Thermal Regulations - General points

Noted SU_RT, this usable floor area as defined by RT 2012 is defined for any building or part of a building used for purposes other than housing, as the built floor area of premises subject to the Thermal Regulations, after deduction of :

• wall surfaces, including insulation ;

• fixed partitions as per plans ;

• poles ;

• stairs and stairwells ;

• sheaths ;

• door and window frames ;

• parts of premises with a height of less than 1.80 m ;

• parts of the lower level used as a stairway or access ramp, or parts of the lower level at which the hoppers of elevators,...