(1) Where a building is divided into divisions, as required by section 6, all division-walls and division-floors shall comply with the requirements of this section.

(2) Fire-resistance rating. – Every division-wall and every suspended floor which is a division-floor shall be of non-combustible material, and shall have a fire-resistance rating of not less than four hours.

(3) Every division-wall shall be constructed as a continuous wall, or as a number of storey-to-storey walls, not necessarily in one vertical plane:

Provided that, where such walls are not in one vertical plane, the floor construction connecting such walls shall have a fire-resistance rating of not less than four hours.

(4) Every division-wall, whether continuous or not, shall –

a) Rest on a construction having a fire-resistance rating of not less than four hours; and

b) Extend to not less than 300 millimetres above the roof-covering:

Provided that, in the following cases, such wall need only be carried up against the underside of the roof-covering, for the full thickness of the wall –

a) Where the roof construction is non-combustible, and collapse thereof on one side of the wall would not endanger the stability of such wall;

b) Where the difference in the height of the roofs of divisions of a building exceeds 1 metre at division-wall, and the roof construction is non-combustible.

(5) Division-floors shall be continuous over the area of the division, except for openings enclosed, as set out in subsection (9).

(6) Openings in division-walls. – Openings in any division-wall shall not exceed 12 square metres in area, and shall have no dimension greater than 3,6 metres.

(7) The aggregate width of all such openings at any storey-level shall not exceed 25 per centum of the length of the wall in which such openings are formed.

(8) Every opening in a division-wall shall be protected by an approved automatic or self-closing fire-door or fire-shutter, and the aggregate fire-resistance rating of the door or shutter shall be not less than four hours:

Provided that, where such opening occurs in the walls between two buildings, a door or fire-shutter shall be required on each side of the walls.

(9) Openings in division-floors. – Every opening in a division-floor shall be protected by an enclosed shaft, and any opening in such shaft shall be fitted with an approved automatic or self-closing fire-door or fire-shutter, and the enclosing-walls and such door or shutter shall have a fire-resistance rating of not less than one and a half hours

(10) Protection of openings in eternal walls at division-floors. – Where a division-floor abuts external walls, the risk of the passage of fire past such floor shall be reduced by protecting the openings here-in after referred to in such walls by non-opening or self-closing fire-windows or shutters, or self-closing fire-doors, having a fire-resistance rating of not less than half an hour, so disposed that every opening within a horizontal band of the external walls of not less than 7,5 metres in height is so protected, and such brand shall overlap the division-floor and be situated above, below or partly above and partly below the division-floor:

Provided that the openings in such external walls need not be protected, as prescribed above, if a canopy or hood of non-combustible material having a fire-resistance rating of not less than one hour is constructed as an extension of the division-floor to project not less than 1,5 metres beyond the exterior face of the external wall abutting the division-floor.

(11) If a canopy or hood is constructed, as in the provision to subsection (10), such canopy or hood shall be provided under every opening in such wall, within a height of 7,5 metres above the division-floor, and shall extend not less than 1,5 metres beyond the vertical lines drawn through the sides of every such opening.