(1) Materials used for scaffolding shall be free from any defects which might impair their resistance.
(2) The lumber used for scaffolding shall be:
(a) in good condition, composed of long non-breaking fibres and free from any defect which might impair its strength;
(b) of a quality equivalent to No. 1 spruce;
(c) barked, if it is rough timber; and
(d) without paint or any opaque coating.
(3) The metal parts of a scaffolding shall:
(a) not be weakened by rust, nor by any corrosive material; and
(b) if tubular elements are used, not be weakened by the effects of cold or heat.