What kind of tape do you use for Hardibacker?
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Then, what tape do you use for Hardibacker?
This QEP Backerboard Seam Tape Roll is self adhering to reduce application time. Can be used for seaming most types of cement backer board and tile underlayment. Fiberglass mesh for added strength.
One may also ask, does backer board need to be taped? For tile backer board such as Durock, Wonderboard, Hardiebacker, Permabase, and others the seams between the board need to be treated with 2-inch alkali resistant mesh tape. Sometimes tiles will pop loose where there's movement. Sometimes it allows an unimpeded way for water to get behind the board and into the wall.
Beside this, do you have to tape seams on Hardibacker?
2 Answers. The thinset and mesh tape are to strengthen the seams. If you are going to tile over the cement board, you should tape the seams. If you just want to leave the corners untreated that will probably be fine, because that seam won't split the center of a tile.
Why tape a Hardibacker seam?
The fiberglass tape reinforces and strengthens the joint. It can make the difference between cracked or intact tiles over the joints. That should be a big enough deal to make taping worth the effort. You should use alkali-resistant CBU tape because the alkali in the thiset can degrade regular fiberglass drywall tape.