Knot Safety

A few weeks ago Boulders Climbing Wall in Cardiff announced a policy that they were banning the use of the bowline knot to tie on at their walls (UKC thread here and article on Boulders website here). This follows two recent tragic accidents in the last 10 months, one at Gloucester and one Stockport, where climbers died after falling the full height of the wall. Initial investigations in both cases seem to suggest that the accidents may well have been caused by a simple bowline knot coming undone when loaded on a fall or while lowering off. These are the first fatalities at climbing walls in Britain since the BMC started keeping its accident database in 2002.

Faced with these bare facts it is easy to understand Boulders decision – the simple bowline appears to be an unsafe knot and no doubt the insurance companies will be looking for action on the part of walls to show that they are taking steps to avoid such accidents happening again.

Before I go any further I should point out that a simple bowline is not a safe knot to climb on and should never be used without the Yosemite (or Edwards) variation, or a stopper knot. I would sympathise with any wall that banned people from using a simple unfinished bowline but in this case the wall has made a blanket ban on all bowline knots, even those that are properly tied. It is my belief that not only is this an unnecessary knee-jerk reaction but, more significantly, it is one which may actually make walls less safe.

The Edwards bowline

The figure that is needed to accurately make this assessment is not how many fatalities there have been since 2002, but how many times has someone plummeted the full length of the wall since each plummet is a potential fatality. It may just be good luck that the other falls haven’t resulted in fatalities and coincidence that the two fatalities appear to have tied on using the same knot. I haven’t got the figures to hand but brief discussion with a few wall owners has revealed exactly what I suspected – most climbers are dropped by their belayers due to inattentive belaying or incorrect use of belay devices. This is a very important issue but a different one to what I wanted to discuss here where the knot used to tie on is the thing that is in question.

So what it the alternative to the bowline? Well it is the rethreaded figure-of-eight (Fo8) – an excellent and solid knot that is taught to most beginners due to it being easy to tie and safe to check. It has certain other advantages and disadvantages over the bowline but overall there isn’t much wrong with it.

The figure of 8 knot, with a stopper

The Fo8 does however have one flaw which has made it responsible for a number of very serious accidents over the years both indoors and outdoors. It is a two part knot; you tie a knot, thread it through your harness and tie the second part of the knot. Without this second part the knot is completely useless. The accidents have occurred when people are distracted mid-way through tying their knot – someone says something, they chat for a minute or two, then stop and start climbing having the impression in their mind that they have already tied a knot. This is easy to prevent with the buddy system and there are also many anecdotal stories of people discovering the unthreaded Fo8 halfway up a climb and having to rescue themselves in a panic. There are also a number of stories (more than 2 since 2002) of people taking long plummets to the ground and sustaining serious injuries due to unthreaded Fo8 knots and ten years ago the Fo8 was the unsafe knot due to some high profile accidents at crags.

The point here is that both knots have been implicated in serious accidents. It would be possible to do some in-depth research to find out which one has the worse record based on wall accident stats and considering every long drop as a potential fatality. The bottom line is though that all this research would probably show is that neither the bowline nor the Fo8 are totally reliable if not properly tied – not really a very startling conclusion!

So to instigate a policy at a wall which forces people to tie a knot they may not be familiar with would seem to me to be increasing the likelihood of people not tying their knot correctly. Far more valuable would be to try and drum into people the benefit of the buddy system, where belayer and climber check each other – how to use it and trying to make it a ritual habit like chalking up before we grab the first hold.

UKC Article on tying the Edwards Bowline



This entry was posted in Discussion.

6 Responses to Knot Safety

  1. hueco65 said on

    All I can say is that trying to escape from a figure of eight that has been loaded by a large fall/falls is very difficult, and trying to escape the system quickly ;particularly with cold fingers/pumped makes this knot a potential liability in an emergency. Al

  2. David Brodie said on

    Any changes to wall operations & climbing which could improve safety ought to be embraced. The bowline depends on a double stopper knot, the Fo8 does not, all the stopper knot ensures is the the tail was long enough. MLT advocate that a thumb knot is adequate to tie in, as long as the tail is long enough. I support walls advocating the use of FoE & stopper knot, as part of their terms and conditions of use. Climbers should not feel their abilities or autonomy is challenged and as long as they are reasonably practicable, accept the rules of the house.

    • Alan James - Rockfax said on

      The bowline does not ‘depend upon a double stopper knot’. A properly tied bowline will work fine without any stopper knot. A badly tied bowline won’t but then neither will a badly tied Fo8. Look at the stats – more people have plummeted the full length of walls and crags due to unfinished Fo8s than badly tied bowlines.

  3. Steve Long said on

    Apart from the issue of the bowline disappearing if it comes undone, I can understand why the wall would prefer the ease of checking the figure of 8. The bowline is definitely harder to check, especially with variations such as the Edwards version and the doubled bowline. And the half-tied figure of 8 is far more dangerous as the chances of failure are 100% whereas with a poorly tied bowline, it might (might!) lead to failure. So are the walls going to check every single knot, because difficulty of checking can be the only reason to ban bowlines. If you are going to insist on any rule I would suggest that insisting on a double stopper knot would be far more productive. Better though to educate people to do a “buddy check” – as Alan says this is the most effective back up. But its impossible to enforce. Legislation won’t prevent accidents at walls, only vigilance by climbers will do that.

  4. Richard Caves said on

    Knot Safety – We need to be very clear that it is not the knot that is unsafe and the cause of the accidents – it is the inability of the users to tie knots correctly, these knots are used hundreds of thousands of times a day and there is no proof that a correctly tied knot is at fault – the phrase ‘a bad workman blames his tools’ springs to mind here. Stopper knots do not add to the inherent strength of a knot, they are more a safety device to insure the tail is long enough in other words the knot is tied correctly. To make a decision to ban a knot that has has been in the core of mountaineering activity since mountaineering started seems a little foolish and ‘big headed’.

  5. Chris Craggs - Rockfax said on

    What puzzles me is the idea of accidents being caused by ‘bowline failure’. If a bowline does/did actually fail, the rope would fall to the ground (along with the leader?) – what evidence would their be that the bowline had ‘failed’ – as opposed to never having been tied?

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