BS 8634:2017 pdf download – Portable roof ladders – Specification
It is not applicable to:
1) aftermarket accessories which are intended to convert leaning ladders into roof ladders;
2) roof ladders for use on mono-pitch roofs, e.g. a pent roof;
3) roof ladders used with personal protection equipment intended as a means of fall arrest unless the roof ladder is part of a proprietary system designed for that purpose; or
NOTE See Annex A for further information.
4) crawling boards for use on roof angles less than 25°.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
BS 245, Specification for mineral solvents (white spirit and related hydrocarbon solvents) for paints and other purposes
BS 7371 (all parts), Coatings on metal fasteners
BS EN 131-1, Ladders — Part 1: Terms, types, functional sizes
BS EN 131-2:2010+A2:2017, Ladders — Part 2: Requirements, testing, marking
BS EN 131-4, Ladders — Part 4: Single or multiple hinge-joint ladders
BS EN 131-6, Ladders — Part 6: Telescopic ladders
BS EN ISO 3834 (all parts), Quality requirements for fusion welding of metallic materials
BS EN ISO 14713-1, Zinc coatings — Guidelines and recommendations for the protection against
corrosion of iron and steel in structures — General principles of design and corrosion resistance
BS EN ISO 14731, Welding coordination — Tasks and responsibilities
3 Terms and definitions
3.1 aftermarket accessory
component not made or supplied by the original equipment manufacturer as a part of the original product but which is added to the product after it has been produced and distributed, to enable that product to serve an additional function
3.2 bearer
component of a roof ladder that provides support between the roof ladder and the roof, spreads the load, provides distance from the roof to the user’s feet and hands and accommodates the
form of the roof
3.3 locking device
means of preventing unintentional movement relative to each other between the connecting parts or sections of extending, hinged, telescopically jointed or multi-part (sectional) roof ladders
3.4 maximum total load
maximum weight that the ladder is designed to support when set up in accordance with the
manufacturer’s instruction
[SOURCE: BS EN 131-2:2010+A2:2017, 3.4]
3.5 ridge hook
component at the top of the roof ladder that utilizes the opposite slope of the roof to retain the ladder
4 Design
4.1 General
The requirements of this British Standard are based upon a roof ladder with a maximum total load of 1 472 N (150 kg). This value, taken from BS EN 131‑2:2010+A2 for tests in the position of use, takes account of the weights of European professionals working at height and their equipment together with factors including safety, dynamic loads and material variations. Roof ladders are assumed to be used by one person at a time.
4.1.1 The roof ladder and its parts shall conform to the requirements of Annex B to Annex I. For all tests in this British Standard, unless otherwise stated in the particular test, the following tolerances shall apply:
• ±1 mm for longitudinal measurements;
• ±5 mm for the measurement of the distance between the supports and the overhanging length;
• ±1° for the measurement of angles; and
• ±1% for static forces and torque.BS 8634 pdf download.