1956-HKRS30-8-46_Part03 — Page 15

8

Demolitiona

Bricks and building blocks.

BUILDING (CONSTRUCTION) REGULATIONS, 1956

Provided that this regulation shall not apply with respect to uny load which may be required or permitted by the Building Authority for the purpose of testing.

8. Where demolitions or other building works are carried out which may affect adversely any adjoining building, it shall be provided with adequate support, and the authorized architect shall submit his certificate in accordance with the provisions of regulation z0 of the Building (Administration) Regulations.

PART 11.

Materials.

9. (1) Every brick and building block shall be composed of hard well-burned clay, natural or cast stone, concrete or other incombustible material of like hardness and durability and shall possess resistance to crushing not less than those respectively specified in Table 1.

(2) Cust stone and concrete blocks shall be cured at normal temperatures until they attain the strengths specified in Table 1 and in any case for not less than 4 weeks.

(3) Every brick and building block shall be of such size, shape and surface as to permit of proper bonding and jointing.

(4) Where bricks and building blocks are formed with cavities, hollows or perforations-

(i) the volume of such cavities, hollows or perforations shail not exceed } the total volume of the brick or building block; and

(ii) such cavities, hollows or perforations shall be so disposed that the aggregate width of solid material measured at right angles horizontally to the face of such brick or building block shall be not less than of the width thereof at any one place;

(iii) no wall of any cavity, hollow or perforation shall be

less than three-quarters inch;

(iv) such bricks or building blocks shall be so laid as not to

provide harbourage for vermin;

(v) no chase or recess shall be formed in such bricks or

building blocks,

BUILDING (CONSTRUCTION) REGULATIONS, 1956

9

(vi) such bricks or building blocks may be used in lead

bearing walls only-

(a) in single storey buildings,

(b) in two storey domestic buildings, or

(c) for enclosing the top storey of a building.

TABLE 1.

Bricks and building blocks.

Description of brick or building block

Purpose

External or internal

(load bearing)

External or internal (load bearing)

External (panel) (non-load bearing)

Internal (partition) (non-load "bearing)

Resistance to crushing in lbs. per aquare inch of grosa harizontal Area

Whether salid or hollow

Sold

1,000

hollow

750

solid or hollow

500

solid or bollow

200

10. Cement shall not be inferior in strength, soundness and Cament. durability to the current British Standard Specification for Portland Cement.

11. Stone lime shall consist of

(u) quicklime formed by burning a natural rock or other suitable material at such a temperature that it will slake when brought into contact with water, or

(b) dry hydrated lime in the form of a fine dry powder produced by treating quicklime so as to produce a dry, sound product:

Provided that the calcium and magnesium compounds present in the lime as oxides shail be not less than 70 per cent by weight,

12. (1) Sand shall-

(4) consist of naturally occurring sand, crushed stone or a

combination of both;

(b)

be hard, clean and free from adherent coatings; (c) contain no appreciable amount of clay balls or pellets;

Linne.

Sand.