9. (1) An employer shall ensure that—

(a) the floors of rooms have no dangerous bumps, holes or slopes and are fixed, stable and, so far as is reasonably practicable, not slippery,

(b) the surfaces of floors, walls and ceilings in rooms are such that they can be cleaned or refurbished to an appropriate standard of hygiene,

(c) access to roofs and suspended ceilings made of materials of insufficient strength is not permitted unless—

(i) equipment is provided to ensure that the work can be carried out in a safe manner, and

(ii) appropriate warning signs in accordance with Part 7, Chapter 1 are placed at such access points,

(d) transparent and translucent walls, in particular all-glass partitions, in rooms or in the vicinity of workstations and traffic routes are—

(i) clearly indicated,

(ii) made of safety material, or

(iii) shielded from such places or traffic routes,

to prevent employees from coming into contact with the walls or being injured should the walls shatter, and

(e) places of work containing workstations are adequately thermally insulated, bearing in mind the type of undertaking involved and the physical activity of the employees.

(2) Paragraph (1)(e) does not apply to places of work in use prior to 31 December 1992 except as regards modifications, extensions or conversions made after that date.