(1) All frames and sashes of skylights, lantern and other similar lights shall be of metal:

Provide that, where such roof-lights are constructed –

a) In dwelling-houses; or

b) In localities where the roof-lights would be exposed to agencies deleterious to metal;

The local authority may permit the frames and sashes to be made of some other suitable material.

(2) All lights referred to in subsection (1) which are –

a) Less than 3 metres from a lateral boundary or an exit-way, and such lights which are inclined at an angle of less than 60 degrees to the horizontal shall be glazed with wired glass of not less than 6 millimetres in thickness; and

b) In positions other than those described in paragraph (a), may be glazed with plain glass.

(3) Every skylight which is glazed with plain glass shall be protected by a substantial wire screen, with wire not lighter than 2,5 millimetres and having a mesh not greater than 15 millimetres, placed not less than 100 millimetres or more than 250 millimetres above the glazed portion of the skylight at all points.

(4) Such screen shall extend beyond the glazing on all sides for a distance of not less than the height of the screen above the glazing.

(5) Where a skylight or lantern-light is located over a stairway, exit-way or an indoor public and assembly occupancy, a similar screen shall also be placed below such skylight or lantern-light.

(6) Notwithstanding any other provision of this section, but subject to the approval of the local authority, roofs may be covered with materials made of incombustible or self-extinguishing plastics or other similar materials up to 10 per centum of the total roof area

(7) Floor-lights of glass or other translucent and brittle material shall not be allowed in floors between the storeys of a building, unless they have a fire-resistance rating equal to that of the floor in which they are contained and comply with any other requirements of these by-laws relating, amongst others, to artificial lighting.