The LACORS guide covers ceiling tiles on page 32
Table C6: Suitable classes of surface finish in
certain locations in multi-occupied residential
buildings.
Class 0, B s3, d2
These are non-combustible materials and materials
of limited combustibility such as brickwork, concrete,
plasterboard and plastered finishes.
Acceptable in all locations including protected
routes, circulation routes, escape routes and
stairways.
Class 1, C s3, d2
These include timber, particleboard, hardboard and
surfaces covered with heavy flock wallpaper, provided
they have been treated with flame retardant materials.
Acceptable in rooms.
Class 3, D s3, d2
These include those specified in class 1 with the
addition of thermosetting plastics and surfaces
covered with polystyrene wall and ceiling tiles.
Not acceptable on escape routes and stairways.
Acceptable in small rooms and parts of other rooms
if the total area does not exceed more than one half
of the floor area up to a maximum of 20m².
Not acceptable on escape routes and stairways.
