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lifestooshort81 08-29-2013 12:03 PM

Drywall knives
Hi folks,
I apologize in advance for what I feel is a silly question but here goes.

What is the difference in the types of drywall blades. I've seen blades called "taping knives", blades called "joint knives". Taping knives seem to be more squared off where joint knives seem to have a rounded side.

I've always used a 4 inch 'joint knife' for taping and larger 'taping knives' for applying top coats and floating. I know how to use the tools just never really learned what the difference between them was!


ToolSeeker 08-29-2013 02:12 PM

Joint knifes usually don't go larger than 6" and are used to bed the drywall tape in the drywall joint. Taping knives are usually 8" up and are used to bury the drywall tape and feather out the mud.

jeffnc 08-29-2013 05:47 PM

Some of it is actually personal preference. Some taping knives (and trowels can be used as well) are actually slightly curved. Some are more flexible than others. These things come into play because depending on what you're doing you might want the flex or the curve. For example, when putting on the thick, second coat of drywall, you're trying to feather out the joint and flatten it. If you use too flexible a knife, it's going to go concave, and you'll get a depression where you actually want buildup. Same goes for the curved knife the wrong way. Using it the other way helps you apply some pressure without getting concave, or applying less pressure and actually getting a bit convex.

lifestooshort81 08-29-2013 08:34 PM

OK very good... I figured it was just a preference thing but was curious as to if maybe I had been taught some convoluted way. I mean my tape seams have always come out well so I guess I've been doing something right. ha-ha!


ToolSeeker 08-29-2013 08:50 PM

Go to all and type in joint knifes then tape kites and you can see the diff.

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