What Is a Taping Knife?

A taping knife or joint knife is a drywall tool with a wide blade for spreading joint compound, also known as "mud". It can be used to spread mud over nail and screw indents in new drywall applications and is also used when using paper or fiberglass drywall tape to cover seams.

Whats the difference between a joint knife and a taping knife?

Some manufacturers make a distinction between joint knives and taping knives. Generally, joint knives are smaller (6” and below) while taping knives are larger (6” and above). ... Taping knives, on the other hand, are typically more rectangular.

How does taping knife work?

Starting in the middle of the newly taped joint, hold your taping knife at a 25 degree angle and pull the knife to one end of the joint, smoothing and pressing the tape firmly into the compound. Return to the centre point and repeat in the other direction. (This prevents the tape from pulling off the wall.)