What do you use to fill cement board seams?


Quote from Youtube video: Tape.

How do you seal joint between cement board and drywall?





Use self-adhesive mesh tape where drywall and cement board meet. Spread 2–3 coats of setting-type joint compound over the seam, waiting 24 hours between coats. Sand the joint to smooth it, beginning with semi-coarse sandpaper and finishing with fine sandpaper.

Can I use joint compound on cement board?

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. Make sure to follow manufacturer guidelines for the products used to finish the non-tiled area.

How do you seal a durock joint?

Cut fiberglass mesh tape to fit in a single layer over every joint where the panels meet, but do not overlap the tape. It’s OK if it’s an inch or two short in spots. The tape is self-adhesive and will stick to the Durock panels. Press and smooth the tape firmly in place.

Should you tape cement board joints?

If you are going to tile over the cement board, you should tape the seams. This should not be that difficult. Pack in thinset, lay on the tape, and flat-knife to get it set in. In the corners, use a corner knife.

How do you finish outside corners of cement board?





Quote from the video:
Quote from Youtube video: But this is actually made for cement board so you basically just get it in the corner like you normally would if you've done any sheetrocking before and taping it's self sticking.

How do you seal cement board?

Quote from the video:
Quote from Youtube video: Use painters tape to protect the tub from the silicon and the waterproofing. Next fill the gaps between the cement board and the tub with silicone. Then allow it to dry before you begin the next.

Can you silicone cement board joints?

Yes, silicone will stick to cement board.

Do you need to tape durock seams?

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. Then a coat of thinset gets flat troweled over the seam. What this does is tie the two boards together and help prevent flexing.

Do you need to seal cement board before tiling?



Although most backerboards currently available won’t fall apart when exposed to moisture and are somewhat water-resistant, they aren’t waterproof. To prevent moisture from seeping through to the wood or metal studs beneath the tile, a barrier or sealant must be used on porous materials.

Can you use joint compound on durock?

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.

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.

How do you fill screw holes in cement board?



Use thin-set mortar to repair cracks or holes in cement boards. Step 3: Mix up a small amount of thin-set mortar following the manufacturer’s instructions. Thin-set mortar typically has a working time of less than 15 minutes, so smaller batches are the way to go.

How do you cover nail holes in Hardie board?

ColorPlus® Products

  1. ColorPlus® Touch-up Kits can be used to cover nicks, scrapes and nail holes that may occur over time.
  2. If the touch up area is larger than the size of a dime, the use of ColorPlus® Touch-up Kit is NOT recommended. It is advised to replace the damage siding with a new section of ColorPlus® siding.


Do you drill pilot holes for cement board?

Although the siding does not require drilling pilot holes, you may need to run wire or cable through the siding, necessitating drilling a hole. While HardiePlank siding offers durability, it easily breaks; therefore, drilling through it requires proper tools and techniques.