Table of Contents
What do you use to seal cement board seams?
Use special mesh tape on seams Cover all of the corners, joints and seams, including the joint where drywall and cement board meet, with the fiberglass mesh tape.
Do you need to tape Hardie board seams?
Alkali-Resistant Mesh Tape. For tile backer boards such as Durock, Wonderboard, Hardiebacker, Permabase, and others the seams between the board need to be treated with 2-inch alkali-resistant mesh tape. It helps to make the walls that are to be tile more monolithic.
Can I use joint compound on Hardie board?
HardieBacker 500 cement board is 0.42 inches thick, slightly less than true 1/2 inch thickness. When using drywall compound over cement board, it is recommended, but not required, to use a faster setting-type joint compound (45 or 90 min), than typical joint compound.
What do you do with a gap between tub and cement board?
Technically, after the tile is installed over the backer board that gap between it and the tub ledge should be filled with an ASTM C920 sealant (caulking e.g. silicone). Although some say you should have weep holes along this gap so any water behind can weep out into the tub.
Should you tape cement board joints?
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. This should not be that difficult.
Should Hardie board be sealed?
APPLICATION: General: James Hardie believes it is good building practice to seal the joints to prevent moisture, such as wind-driven rain and snow, from penetrating the wall cavity. Caulking around windows, doors, eaves and trim edges gives added insurance that leaks will not occur.
Should you waterproof Hardibacker?
Hardiebacker (James Hardie): the use of a waterproof membrane, vapor barrier or vapor. retarding membrane is optional unless the local building code requires it.
Do you need waterproof membrane on cement board?
Contrary to popular thought, tile and grout are not waterproof, and some moisture will penetrate even if sealant is used. However, if you choose to use concrete backerboard, which is much stronger and more durable than gypsum board, a water vapor membrane must be placed underneath it or a sealant applied on top of it.
Should you tape Hardibacker?
Hardibacker 500 inside showers will be taped with Alkali Resistant Mesh tape and thinset. Hardi outside of showers will be taped with ARM tape and joint compound (and textured with all purpose joint compound). –Hardi says not to use paper tape—alkali environment will destroy it. You must use ARM mesh tape.
What kind of tape do you use on cement board?
FibaTape® self-adhesive Cement Board tape is specifically designed for cement board finishing. Cement Board tape is alkali-resistant to meet most cement board manufacturer’s recommendations. The patented fiberglass construction provides long-term crack resistance.
Can you use all purpose joint compound on cement board?
Things You’ll Need Durock Cement Boards are a type of drywall reinforced with cement for a harder surface. This type of wall material can be finished just like ordinary drywall, using joint tape and joint compound.
Can I use drywall mud on Hardibacker board?
Hardiboard has even more texture than sheetrock for mud adhesion and at least as good of moisture absorption, so mud should adhere quite well. Certainly the flex of Hardiboard is less than sheetrock, so there should be no issues with flexing causing cracking of dried mud.
Do you need Thinset under Hardie board?
However, many manufacturers including, both Durock and Hardiebacker not only recommend that you use thinset under their backerboard, but they specify it and will void the warranty on their product if it’s not used. Thinset is going to create a solid surface under tile and prevent flexing that could lead to cracking.
Do you need a vapor barrier behind cement board?
If it’s a cement board, you need a vapor barrier, because cement retains moisture, which means the wood next to it is always damp.
How do you tape joint between cement board and drywall?
Spread joint compound over the length of the tape with a 6-inch drywall knife. Make the seam just wide enough to cover the entire surface of the tape (generally 3 inches). Get it smooth and flat. Dab additional compound over the screw holes on both the drywall and cement boards, near the seam but not under the tape.
What kind of caulk do you use on hardiplank?
So, here I am telling you about the best caulk for Hardie siding.Comparison of Our Best Caulk for Hardie String. Product Type Weight DAP INC 18152 Silicone 10.1oz GE Sealants & Adhesives M90015 Silicone 10.1oz Dap 18001 Kwik Seal Caulk Silicone 5.5oz Gorilla White 100 Percent Silicone Sealant Caulk Silicone 10.1oz.
How often do you caulk hardie board?
Caulk requires maintenance – Caulk manufacturers and industry experts agree that the caulk in field butt joints and horizontal laps will need to be periodically removed and/or reapplied to maintain the seal over the life of the building. 3.
Do I need to use RedGard over Hardibacker?
You really don’t need the RedGard, but the more protection the betterso go for it. And yes, you can do the boards beforehand. But, hit the filled seams & screws (your weak points) as soon as a panel is ready to give it some time to setup. You’ll have to wait for the fills to dry or at least setup anyway.
Can you tile straight onto Hardibacker?
HardieBacker can take up to 200kg of tile hanging weight per m2 so almost any tile can be fixed. Once secured cover the joints with Alkaline-resistant tape and feather the tile adhesive to leave a 150mm wide joint.
Can you tile over cement board without waterproofing?
Tile and grout are not waterproof Cement board will not fall apart when exposed to water. But like a concrete walkway, it can soak up water. It can also dry out and be perfectly fine. The second coat of Hydroban (light green) is being applied to the top of the half-wall.
