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Comment: Added table about strength reduction. Reorganized and added to resources.

Knot Strength

...

Lines will first fail at the knot. The following table is adapted and expanded from Poynter:

KnotReduction in T.S. PercentSourceNotes
Overhand55Poynter 
Square50Poynter 
Bowline40Poynter 
Splice20Poynter 
    
    
    

How-To Tie Knots

Butterfly Knot

Spectra Line Slip-Resistant Knot

Finger trap technique

Resources

Dan Poynter, The Parachute Manual: A Technical Treatise on Aerodynamic Decelerators, Third Ed.

Richards, Knot Break Strength vs Rope Break Strength