I have read through this and similar postings online and I have not seen where the thickness is specified. I work for a metal fabricating company and we are building ladders for a customer; hence why I am looking for the required thickness.
" I work for a metal fabricating company and we are building ladders for a customer; hence why I am looking for the required thickness. "
I suspect OSHA expects you to design, test, and build the ladder. If you do not have professional structural engineers on your payroll you would have to hire one.
See part 1 from Alberta (Canada) OH&S, this may be what you're looking for:
"Design criteria
130(1) An employer must ensure that a fixed ladder installed on or after
April 30, 2004 meets the requirements of PIP Standard STF05501 (February 2002),
Fixed Ladders and Cages, published by the Construction Industry Institute.
(2) Despite the material and process standards referenced in PIP Standard
STF05501, an employer may use applicable Canadian material and process
standards if the employer ensures that the fixed ladder is designed and installed
in accordance with established engineering principles.
(3) If a fixed ladder is made of a material other than steel, the employer must
ensure that the design is certified by a professional engineer as being as strong as
or stronger than that required by PIP Standard STF05501.
(4) The employer must ensure that a self?closing double bar safety gate, or
equally effective means, is provided at ladderway floor openings and platforms
of fixed ladders installed on or after April 30, 2004.
(5) Subsection (4) does not apply at landings.
(6) Section 327 applies to a fixed ladder on a scaffold."
