### Building (Standards of Sanitary Fitments, Plumbing, Drainage Works and Latrines) Regulations 《建築物(衞生設備標準、水管裝置、排水工程及廁所)規例》

34. Materials for pipes
(1) Every soil pipe, waste pipe, anti-syphonage pipe, ventilating pipe, overflow pipe and every pipe connected with any drain provided for the carriage of foul water shall be—
(a) circular in shape; and
(b) constructed of cast iron, steel, copper or other approved material.
(2) Every rain water pipe shall be constructed of cast iron, copper or other approved material. (L.N. 295 of 1986)
(3) All such materials shall be sound and free from defects.

35. Connexions of pipes, etc.
Every connexion of a soil pipe, waste pipe, anti-syphonage pipe, ventilating pipe, rain water pipe or overflow pipe with any other pipe, or with a trap, gutter or other fitting, as the case may be, shall be made in a manner suitable to the nature of the materials of which such pipe and such other pipe or trap, gutter or other fitting are constructed, and so as to be watertight. 
(G.N.A. 107 of 1959)

36. Fixing of pipes
(1) Every soil pipe, waste pipe and rain water pipe shall be securely fixed to the wall of the building for which it is provided.
(2) Any hole which is made in any floor or wall in order to admit any such pipe shall be properly filled in and sealed round the pipe.

37. Pipes in ducts
Where a soil pipe, waste pipe, anti-syphonage pipe, ventilating pipe, or rain water pipe is fixed in a duct within a building, access panels shall be provided of such size and so situated that adequate access is available to all pipe connexions within the duct.

38. Eaves gutters
(1) Eaves gutters shall be—
(a) made of cast iron or other approved material;
(b) fixed at a gradient not less than 1 in 100; and
(c) properly connected to rain water pipes.
(2) The size of eaves gutters shall be calculated at the rate of 700 mm2 of cross sectional area of gutter to every 7 m2 of horizontal roofed-over surface. (L.N. 294 of 1976)

38A. British Standard Specification and other national standards
The Building Authority may permit, in writing and subject to such conditions as he may endorse thereon, the use of materials or the carrying out of any works that are subject to this Part in accordance with a relevant British Standard Specification, British Standard Code of Practice or other national standard accepted by the Building Authority and that prescribes the quality of material or standards of workmanship.
(L.N. 361 of 1980)

### Building (Standards of Sanitary Fitments, Plumbing, Drainage Works and Latrines) Regulations 《建築物(衞生設備標準、水管裝置、排水工程及廁所)規例》

39. Drainage of buildings
Every building shall be provided with such pipes, drains and channels as are necessary for the disposal of all foul water and surface water from the building.

40. Disposal of foul water
(1) Drains and private sewers, provided for the carriage of foul water, shall, where there is a public sewer provided for the carriage of foul water at a suitable level and position within 30 m of the boundary of the lot on which the building, for which such drains or private sewers are provided, is erected, be connected to such public sewer. (L.N. 294 of 1976)
(2) Where there is no such public sewer, the Building Authority may, by order in writing, require the owner of any building to provide a septic tank, a cesspool or other approved facility. (L.N. 361 of 1980)

41. Disposal of surface water
(1) Save as provided in paragraph (2), all surface water from a building shall, if there is a public sewer, provided for the carriage of surface water, at a suitable level and position within 30 m of the building, be conducted, by means of rain water pipes and drains provided for the carriage of surface water, to such public sewer or, where there is no such public sewer, shall be conducted, to the satisfaction of the Building Authority, to a public channel provided for the carriage of surface water or to the side channel in a street. (L.N. 294 of 1976)
(2) Where there is no such public sewer and no public channel or side channel in a street, such surface water shall be conducted, to the satisfaction of the Building Authority, to a stream course or nullah.

42. Pipes carrying surface water not to discharge across surface of footpath
No pipe provided for the carriage of surface water from a building shall discharge across the surface of any footpath in a street.

43. Disposal of sub-soil water
Drains provided for the carriage of sub-soil water may be connected to a private or public sewer provided for the carriage of surface water or to a drain provided therefor.

### Building (Standards of Sanitary Fitments, Plumbing, Drainage Works and Latrines) Regulations 《建築物(衞生設備標準、水管裝置、排水工程及廁所)規例》

44. Materials for drains, etc.
(1) Covered drains (except covered drains provided for the carriage of sub-soil water) and covered sewers shall be made with good sound pipes of glazed earthenware, stone ware, concrete, cast iron or other approved material.
(2) Drains and sewers above the ground shall be laid with cast iron pipes or other approved materials. (L.N. 361 of 1980)
(3) All pipes used in the construction of any drain or sewer shall—
(a) be of true bore;
(b) have smooth internal surfaces; and
(c) be impervious.
(4) Cast iron sewage pipes shall be protected against rust and corrosion by a suitable asphaltic coating.
(5) Earthenware, stone ware and concrete pipes shall—
(a) in the case of pipes with a diameter not exceeding 150 mm, have a thickness equal to not less than one-ninth of the diameter of the pipe; and
(b) in the case of pipes with a diameter exceeding 150 mm, have a thickness equal to not less than one-twelfth of the diameter of the pipe. (L.N. 294 of 1976)

45. Sub-soil water drains
Drains provided for the carriage of sub-soil water shall be constructed with clay field pipes or other suitable pipes and shall be laid to adequate falls.

46. Size of drains
All drains and sewers shall be of adequate, but not excessive, size for the purpose for which they are provided:
Provided that no covered drain shall have an internal diameter of less than 100 mm.(L.N. 294 of 1976)

### Building (Standards of Sanitary Fitments, Plumbing, Drainage Works and Latrines) Regulations 《建築物(衞生設備標準、水管裝置、排水工程及廁所)規例》

47. Laying of drains and sewers
(1) All drains and sewers (except drains provided for the carriage of sub-soil water) and traps shall be firmly laid on a bed of concrete not less than 100 mm in thickness and at least 150 mm wider than the diameter of the pipe or trap, and shall be haunched with concrete so that the full width of the bed is carried up to the level of the horizontal diameter of the pipe and from that point splayed up on both sides of the pipe from the full width of the bed to meet the pipe barrel tangentially. (L.N. 294 of 1976)
(2) All drains and sewers shall be supported along the full length of the barrels and not by the sockets.
(3) Where any drain or sewer is laid in soft and yielding ground—
(a) adequate support shall be provided for such drain or sewer; and
(b) save where the same are provided for the carriage of sub-soil water, the pipes shall be completely surrounded by at least 100 mm of concrete. (L.N. 294 of 1976)
(4) Cast iron pipes above the ground may be carried on adequate piers or other sufficient supports, if such support is provided at each joint.