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.
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What do you seal backer board joints with?

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.
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What do you seal durock seams with?

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.
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Do you need to seal cement board?

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.
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Do you need to use Redgard over cement board?

No, you don't need to apply Redgard over your Hardibacker. Here's why: Redgard works best on cement boards and plywood because it prevents water from seeping into those surfaces. It can also work on top of drywall that isn't behind a tub or shower, but it will eventually wear off after repeated moisture exposure.
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How to Install Cement Board for Beginners



Do you have to tape cement board before tiling?

If you are going to tile over the cement board, you should tape the seams. This should not be that difficult.
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What kind of joint compound do you use on cement board?

For best results getting a good finish between cement board and drywall, use a setting-type joint compound. This product produces a better finish over mesh tape than all-purpose 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.
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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.
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Can drywall mud be used 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.
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Can you use Mastic on cement board?

The textured side is ideal for mortar applications, as it enhances bonding and reduces tile slip. That said, mastic or thin-set mortar can be used on either side of the board without compromising performance.
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How do you mud a cement board?

The correct way to "mud the joints" is going to be to use tile thinset and a fiberglass tape made for cement board. It's similar to the sticky fiberglass tape made for drywall, but its thicker and more abrasion resistant since the thinset has sand in it and can be vary abrasive.
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Is mortar the same as thinset?

Thinset, while it is also sometimes referred to as a “mortar” is an adhesive. It's a mix of cement, water, and fine sand. It holds your tile to the substrate and is used in commercial applications, “wet wall” applications (such as a shower floor), or with heavier tiling materials such as Ankara Travertine Stone Tile.
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What do you tape and mud cement board with?

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.
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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.
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Does drywall mud stick to Hardibacker?

Texture can be applied to HardieBacker board in the same way as drywall.
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Is thinset mortar waterproof?

Yes, Thinset is waterproof. It is used in wet areas like the shower. It has additives that contribute to its waterproofing nature. So, if you're planning to install tiles in your showers or bathroom, thinset will come in handy.
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Does thinset stick to RedGard?

You can install thinset mortar and tile directly onto RedGard. For best results, mix mortar in small batches and apply it to the shower wall a small area at a time. Use a notched tile trowel to spread mortar whenever you are tiling over RedGard.
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What type of thinset should be used with RedGard?

The Flexbond modified thinset, which is sold at HD, lists redgard as one of the surfaces it can be applied to and therefore, following manufacturer recommendations, a person should be using a modified thinset like Flexbond over Redgard.
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What is RedGard used for?

A ready-to-use elastomeric waterproofing membrane for both commercial and residential tile and stone application. Suited for interior and exterior substrates, RedGard® creates a continuous waterproof membrane barrier with outstanding adhesion and reduces crack transmission in tile and stone floors.
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Should I use thinset or mastic?

Thinset can be used in very wet areas, even areas that will be completely submerged in water. Mastic can be used in dry or damp areas only. It cannot be used in areas that will be submerged in water, such as swimming pools. Thinset can be used for showers, bathtubs, backsplashes and other areas.
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