Question: Do You Need To Use RedGard Over Cement Board?

Will Thinset adhere to RedGard?

Mike.

You”ll be fine with thinset over Redguard on walls.

It’s recommended for waterproofing niches, shelves, and entire shower walls when tar paper or poly are not used as a vapor barrier behind the CBU..

Can you use cement board in a shower?

In showers, the standard substrate is tile backer, also called cement board or cement backer board. Ceramic and porcelain tile, more than almost any other surface material, needs a stable, flat, flex-free substrate. Even the slightest amount of movement in a building structure can telegraph to the tile and crack it.

Can you install tile over RedGard?

When you are finished you should let the walls completely dry for a day before tiling. Your tile can then be installed directly onto your walls over the membrane with a proper thinset mortar. … Basically any place that does not have waterproofing between the tile and shower framing. I always have Redgard with me.

Can you tile on top of RedGard?

Using RedGard under floor and wall tile will create a barrier that will be undisturbed after the tile is installed and grouted. … When RedGard is wet, it is a hot, fluorescent pink color. When it dries, it is a solid, dark red, so you know when it is time to apply thin-set mortar and tiles.

How long does Thinset need to dry before RedGard?

24 to 48 hoursThe humidity, temperature and air flow in a room affect how long it takes to dry, but thinset generally is cured and ready to walk on or grout in 24 to 48 hours. Some installers and home specialists recommend waiting 72 hours for tiles applied to floors.

Do I need to use RedGard over Hardibacker?

You really don’t need the RedGard, but the more protection the betterso go for it. … Redgard on Hardibacker Board The trend these days is toward waterproof showers, so redgard will be better than a vapor barrier behind the cement board. Take a look at the Schluter Kerdi shower information on the Schluter site.

Can you put RedGard on cement board?

You can apply RedGard to concrete, cement backerboard, exterior grade plywood and exterior decks. It also bonds directly to metal and plastic drain assemblies. RedGard is tough enough to be used as a shower pan liner. … Any contaminants can prevent RedGard from bonding.

Do I need a vapor barrier behind cement board in shower?

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.

Can you tile straight onto HardiBacker?

The Hardibacker will be fine to tile straight onto.

Do you put Thinset under Hardibacker?

The installation manual for HardieBacker suggests to embed it in thin-set and it should be installed over plywood. Thus I would suggest removing the current wood planks flooring, install a 3/4″ outdoor grade plywood, thinset and then your HardieBacker (screwed down). … You do not need to tape or thinset.

Do I need to seal cement board before tiling?

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.

Does cement board need to be waterproofed?

Concrete backer-board, once commonly referred to in the field by the brand name Wonderboard(r), is a cement product designed as a sheathing material for walls and floors. … Most concrete backer-boards on the market today are not water-resistant, but all are waterproof.

Does Hardibacker need to be waterproofed?

Passing ANSI 118.10 for waterproofness, HardieBacker® 500 Waterproof Cement Board protects tile installations and wall cavities from moisture penetration, eliminating the need to spend extra time applying waterproof coating across the entire surface area of your wall project.