Hong Kong Regulations

BUILDING (CONSTRUCTION) REGULATIONS - REGULATION 81

Weep holes

Further requirements for masonry retaining walls

(1) Adequate weep holes shall be Provided through the face of every masonry
retaining wall other than a retaining wall which is subject to regulation 48
of the Building (Planning) Regulations ( Cap 123 sub. leg.).

(2) A layer of drainage and filter material at least 300 mm thick shall be
provided at the back of every masonry retaining wall. (Enacted 1990)