Analysis of information sources in references of the Wikipedia article "Figure-eight loop" in English language version.
The reality of the so-called 'back-up knot'is that it is not necessary.
may seriously weaken the knot if you use the inside of the knot as a belay loop
Tying a double overhand or barrel knot in front of the figure 8 follow through does not alter the failure mechanism of the knot. It simply adds another step to an already secure knot.
When tied correctly, the knot is tight, with a 5- to 8-inch tail ... Tie the figure eight so that its loop is about the same diameter as your belay loop. The figure eight knot does not require a backup knot.
make certain you leave a long tail, and finish this with a Double Fisherman's
A stopper knot must be added when the threaded figure eight loop is used to tie on a line.
The figure eight follow-through does not require a backup ... but it can't hurt to use one
min. 10 cm
You do not need a backup knot behind a figure eight tie-in knot nor should students be taught that 'messy' knots are weaker than 'correct' knots.
min. 10cm
If correctly tied, dressed, and set then it does not need an additional stopper knot to secure the tail. ... I would recommend allowing a tail of 100mm.
Make sure your knot is well tied, tight and has a stopper knot. Adding a stopper knot adds another link to the safety chain.
a situation to be aware of is when the climber belays off the rope loop rather than the harness belay loop
You do not need a backup knot behind a figure eight tie-in knot nor should students be taught that 'messy' knots are weaker than 'correct' knots.
For instance, the overhand knot can be used to secure rope ends after ... a rewoven figure eight (fig. 9-4c). ... The rewoven figure eight is finished off by tying an overhand knot in the loose end of the rope.
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