i change my ladders every three years regardless off condition for all they cost as i employ guys i dont take any chances for a large double section ,i pay a couple of hundred for them wooden with aluminium rungs ,i still use wood ,no1.becase it is kinder to sand stone and plus it wears away after constant use and gives you a good idea as to the condition they are in ,i use swivel suction cups on all ladders, and as soon as the rubber is thread bear it gets replaced for a couple of quid
small price to pay for pice of mind costs me about a grand every three years but i need them for work end off
you think how much you spend a month on your mobile phone bill and i like most could do without it at times but my ladders i cant
just number each one and give it log book ie weekly check
if sat get an employee to sign they use them every day and should know what needs re[placed have a small stock and get them to doccument it if they replace anything hope this helps
think safe be safe none off the car booty crap for me and my lads
and its all tax deductible
bonus
dont f,,k about when it comes to ladders
yours davis