a. Form a complete barrier in the same continuous vertical plane through the full height between the building and station it separates, including roofs and basements, shall be imperforate except for provisions of openings permitted under Cl.3.6.2;

b. Have the appropriate fire resistance to comply with the requirements of Cl.3.3;

c. Be constructed of non-combustible materials, together with any beam and column which form part of the wall and any structure which it carries; and

d. Not include glass fire resisting walls.

A separating wall shall have no openings except for:

a. A door required to provide a means of escape in the event of a fire, having the same fire resistance as that required for the wall and complying with Cl.3.9.2, or

b. A door provided for the purpose of public circulation, having the same fire resistance as that required for the wall and complying with Cl.3.9.2, or

c. An opening for the passage of a pipe complying with the relevant provisions of Cl.3.9.3.

A separating wall shall be either carried up to form a close joint with the underside of a pitched roof of non-combustible covering or carried up above the level of such roof covering. The junctions between such separating wall and roof shall be properly fire-stopped so as not to render ineffective the resistance of such separating wall to the effects of the spread of fire.

If any external wall is carried across the end of a separating wall, such external wall and separating wall shall be bonded together or the junction of such walls shall be fire-stopped to comply with the requirements of Cl.3.12.

No combustible material shall be built into, carried through, or carried across the ends of or carried over the top of separating walls in such a way as to render ineffective such separating walls to the effects of the spread of fire.