OAP's fatal mistake on climb wall; ACCIDENT.
David Rothman, 73, described as "meticulous" in his hobby, fell more than 30ft from a climbing wall on November 7 last year.
The father-of-two, a retired aerospace engineer, died two days later in hospital.
Experts said he had probably used a bowline knot rather than a figure of eight, which was more likely to slip unless a stopper knot was tied, the inquest heard.
Mr Rothman, from Bredon, Worcs, failed to tie the stopper and his rope gave way just as he was to descend from the top at the Warehouse centre in Gloucester. Coroner David Dooley said at the city hearing it was a tragic human error, adding: "Had a stopper knot been used, the rope probably would not have failed."