Apply Several Coats of Joint Compound – To get a good seal on a seam between drywall and cement board, apply 2–3 coats of joint compound. Wait 24 hours between coats of joint compound to allow it to fully dry. For best results getting a good finish between cement board and drywall, use a setting-type joint compound.
Apply 2–3 coats of joint compound to the seam between wall boards.Wait at least 24 hours between coats of joint compound.Use this setting-type joint compound over mesh tape for best results.Do not use thinset mortar to seal a joint between drywall and cement board.
Joint compound is the best choice where drywall meets cement board. This is because you can sand and achieve a smooth finish with joint compound on drywall. If you use thinset mortar at the point where drywall and cement board meet, the thinset mortar will leave a poor finish on the drywall, regardless of how carefully you sand. We earn a commission if you click this link and make a purchase at no additional cost to you.
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How to finish a joint between drywall and cement board?
How to fill gaps in your drywall
Step 1 – Apply a length of mesh-style, self-adhesive drywall tape lengthwise over each of the seams that are between the drywall and the cement board, rolling the sticky side of the tape out along its length and pressing it firmly to the surface with your palm.
How do you stick drywall tape to cement board?
Step 1 – Apply a length of mesh-style, self-adhesive drywall tape lengthwise over each of the seams that are between the drywall and the cement board, rolling the sticky side of the tape out along its length and pressing it firmly to the surface with your palm.
How do you cut tape to size for drywall?
Step 3 – 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.
Can you use cement board for bathroom walls?
Step 1 – Apply a length of mesh-style, self-adhesive drywall tape lengthwise over each of the seams that are between the drywall and the cement board, rolling the sticky side of the tape out along its length and pressing it firmly to the surface with your palm.
