(a) a maximum length of 4.8 m, measured along the side rails;
(b) a maximum spacing of 400 mm between the side rails, unless the site where the ladder is used precludes this. In such a case, the width of the ladder may be reduced accordingly;
(c) a maximum spacing of 300 mm between the cleats. Such spacing shall be uniform within a flight.
(2) Any wooden ladder must have:
(a) 2 side rails of at least:
i. 38 mm × 89 mm for single ladders; or
ii. 38 mm × 140 mm or 89 mm × 89 mm for double-width ladders;
i. of not less than 38 mm × 89 mm; and
ii. resting on filler blocks of not less than 38 mm × 38 mm.
(3) Any double-width ladder shall:
(a) have 3 rails evenly spaced;
(b) be at least 1.5 m in width and not more than 2 m in width;
(c) have cleats in one piece that extend the full width of the ladder;
(d) be made of materials whose size is corresponding to those listed in subsections 1 and 2; and
(e) be solidly fastened in place.
(4) The wood used for a ladder shall fulfil the following conditions:
(a) it shall be in good condition, shall be derived from species having long non-breaking fibres and shall be free from any defect that might impair its strength;
(b) it shall be of a quality equal to No. 1 spruce;
(c) if it is in the form of logs, it shall be debarked;
(d) it shall not be covered with paint or any opaque coating.
(5) Where it is foreseen that a site-fabricated ladder will exceed the permitted maximum length of 4.8 m, the ladder must be designed by an engineer, as attested to by a plan or certificate signed and sealed by the engineer.
R.R.Q., 1981, c. S-2.1, r. 6, s. 3.5.4; O.C. 329-94, s. 36; O.C. 606-2014, s. 10.