10. Surfaces

10.1 Surface area

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 ;

• ...