B 118
[Subsidiary]
Topmost storeys.
L.N. 294/76.
Openings in
walls separating compartments or
enclosing staircases.
Borrowed lights.
L.N. 294/76.
Basements.
CAP. 123] Building (Construction) Regulations
[1985 Ed.
187. Where compartments of a building to which the provisions of regulation 185 apply are situated in the topmost storey of a building, the walls required by that regulation shall be carried up to the underside of the roof of the storey:
Provided that where the ceiling is formed beneath a pitched roof, the walls need only be carried up to the underside of the roof so as to form in the roof space vertical firechecks at a distance apart not exceeding 35 m.
188. Walls separating compartments of a building or enclosing staircases, in accordance with regulation 185 or 186 may have openings where-
(a) the door and frame of such opening has an F.R.P.-
or
(i) in the case of walls separating compartments, † hour,
(ii) In the case of walls enclosing staircases, the period required for such walls:
Provided that in no case shall the door have an F.R.P. less than hour; and
(b) such door is self-closing, except in the case of such a door in a domestic building which does not lead from a staircase to a corridor used in common.
189. (1) Borrowed lights may not be provided in walls separating compartments of buildings in accordance with regulation 185.
(2) Where borrowed lights are provided in any wall enclosing, in accordance with regulation 186, a staircase-
(a) the area of such lights shall be not more than of the total
area of the wall; and
(b) the lights shall be glazed with a 6 mm wired glass or
covered with glass bricks or blocks.
190. Each element of construction in a basement shall have an F.R.P. of 4 hours.
L.N. 363/84.
Doors for the disabled.
(Cap. 123, sub. leg.)
[*In operation on
1.8.85)
PART XVII
MISCELLANEOUS
191. Where any doors for disabled persons are provided in accordance with regulation 72* of the Building (Planning) Regulations
(a) double-action self-closing doors shall have a check mechanism to prevent the doors swinging beyond the closed position and a transparent panel with a bottom edge not more than one metre and the top edge not less than 1.5 m above floor level;
(b) door handles shall be not less than 900 mm and not more than 1.05 m above floor level, measured from the top surface of the grip; and
(c) door thresholds shall not exceed 25 mm in height.