What is the preferred knot for joining two pieces of webbing together?

The preferred knot for joining two pieces of webbing together is the water knot. This knot is specifically designed for use with flat webbing because it is known for its security and reliability in maintaining strength while under load. When tied correctly, the water knot creates a strong joint that does not slip, making it an ideal choice for situations such as rescue operations or when creating harnesses.

The water knot is formed by tying two opposing overhand knots in the webbing and then inserting the running end of the second piece through the first knot. This method of joining makes it less likely to come undone compared to other types of knots, which can be especially important in high-stress environments like firefighting.

In contrast, while square knots or double knots may be used in various scenarios, they aren't as effective or secure when it comes to webbing. They can slip or come undone, posing significant safety risks. The bowline knot, although useful for creating loops in a line, does not effectively join two pieces of webbing together. Thus, the water knot is the most appropriate and safest choice for this purpose.