Double Sheet Bend

A sheet bend with a second wrap for ropes of unequal thickness.

Keep both wraps together and both short ends on the same side.

Step-by-step

Form a bight
Fold the thicker rope. Bring the thinner rope toward the opening.
Enter the opening
Pass the thinner end through the bight from behind.
Pass the right leg
Bring the end forward and up beside the bight's short end.
Wrap both legs
Carry the end behind both legs and around the left side.
Tuck under the entry
Bring the end across the front, then under its own incoming strand.
Wrap a second time
Continue around both bight legs again, inside the first turn.
Tuck again
Pass under the incoming strand again. Keep the two turns side by side.
Extend the tail
Leave both rope tails on the same side of the knot.
Dress and tighten
Pull the standing parts apart and guide the turns together. Keep the tails clear.
Inspect the knot
Check two turns around both bight legs and two tucks under the incoming strand.