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Diagnal Lashing

Step by step:

Use

Diagonal lashing is used to bind poles together that cross each other but do not touch when their ends are lashed in place in a structure.

Comments

The diagonal lashing gets its name from the fact that the wrapping turns cross the poles diagonally. The diagonal lashing can be used to bind poles that cross each other from 90o to 45o. If the angle between the poles is less than 45o a shear lashing should be used. The diagonal lashing makes use of the timber hitch to pull poles together that are not touching each other. The timber hitch allows the poles to be drawn together without changing the relative positions of the poles. [NOTE] If a square lashing were used to bind poles that do not touch, the beginning clove hitch would pull the cross pole toward the clove hitch causing unnecessary bowing of the cross pole and could also produce a force that would act along the length of the pole to which the clove hitch is tied. These additional forces, if strong enough, can place unnecessary strain on other lashing within the structure causing the structure to twist and fail.

Narration

1. Tie a timber hitch diagonally around both poles.
   
   
2. Start the wrapping turns on the opposite diagonal to the timber hitch, by pulling the rope tight so that the poles contact each other.
   
   
3. Take 3 to 4 wrapping turns; keep the wrapping turns parallel; pull each wrapping turn tight. [NOTE] If the wrapping turns are allowed to cross, the increased friction between the strands of the rope will make it difficult to tighten the wrapping turns.
   
   
4. Start the second set of wrapping turns by going past and around the vertical pole. [NOTE] Going around the pole the rope allows the direction of the rope to be changed without crossing the first set of wrapping diagonally.
   
   
5. Take 3 to 4 wrapping turns; be sure to keep the wrapping turns parallel; pull each wrapping turn tight.
   
   
6. Start the frapping turns by going past and around one of the poles. [NOTE] Going around the pole with the rope allows the direction of the rope to be changed without crossing the wrapping turns diagonally.
   
   
7. Take 2 to 3 frapping turns; keep the frapping turns parallel. Be sure to pull each turn tight.
   
   
8. End the lashing with a clove hitch. Take the first half hitch of the clove hitch by going past and then around one of the poles. Lock the half hitch tight against the lashing by working it tight.
   
   
9. Take a second half hitch around the pole.
   
   
10. Work the second half hitch tight against the first half hitch so that the clove hitch is locked against the lashing.
    
    

Note

If very smooth rope is used, the lashing can be made more secure by adding a third or forth half hitch to the clove hitch.

Use to attach a rope to a pole, this knot provide a quick and secure result. It rarely jams, and can in fact suffer from the hitch unrolling under tension if the pole can turn. Often used to start and finish lashings. With practice, this can be easily tied with one hand - especially useful for sailors!

Tip. If you are in a situation where the clove hitch may unroll, add a couple of half hitches with the running end to the standing end of the knot, turning it into a "Clove Hitch and Two Half Hitches"! Tip. When pioneering, use the Round turn and two half hitches to start and finish your lashings instead of the Clove Hitch. It won't unroll, and is easier to finish tying off. It just does not look so neat!

Used to attach a rope to a log, or where security is not an issue. This knot tightens under strain, but comes undone extremely easily when the rope is slack. Wrap the rope around the log, then pass the running end around the standing part of the rope. Finally twist the running end around itself three or four times. (Note: this is only shown twice in the animation.)