FCAB Rules 47Chapter IV · Structural Materials and Control

Section 47 · Hollow bricks and block walls. Sections 43(2), 57(2)(m)

- Where any wall or any part of a wall is constructed as hollow wall

(i)

the cavity between the inner and outer parts of the wall shall throughout be of a width not less than 5 centimetres and not exceeding 10 centimetres.

(ii)

the inner and outer parts of the wall shall be securely tied together with suitable bonding ties of adequate strength, galvanised iron or other suitable material tarred and sanded before use or other suitable materials, the ties being placed at distance a part not exceeding 1 metre horizontally and 0.5 metre vertically. The clamps in successive courses shall break joints.

(iii)

the inner and the outer parts of the wall shall each be not less than 10 centimetre thick throughout, except that in a wall exceeding 6 metres length and 3.5 metres in height a proper structural design shall be submitted.

(iv)

the cavity may be reckoned as part of the thickness prescribed for walls by these rules where such thickness does not exceed 20 centimetres but shall not be so reckoned where such thickness exceeds 20 centimetres. All external cavity walls shall be ventilated and drained properly. The normal rule in that combined thickness of the walls (excluding cavity) should be equal to the thickness demanded for any solid wall with the given conditions for height and length. If the internal wallis half brick thick, it shall be laid in cement sand mortar 1:4 and reinforced with hoop iron as the outer wall.

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