Compartment walls and floors in Purpose Group 1(b), (c) and 1(a) dwellings

The following walls or floors should be constructed as compartment walls or compartment floors – (a) in a building of Purpose Group 1(b) or (c) – (i) a wall which separates semi-detached dwellinghouses or dwellinghouses in a terrace (in these cases each dwellinghouse should be treated as a separate building); and (ii) a wall or floor which separates a dwellinghouse from an attached or integral garage; (b) in a building of Purpose Group 1(a) – (i) every floor, other than a floor within a flat with more than one storey; (ii) every wall which separates a flat from any other part of the building; and (iii) every wall enclosing a communal waste container;