Can you use Mapei AquaDefense on plasterboard?

Asked By: Yessica Luethgen | Last Updated: 6th March, 2020
Category: style and fashion bath and shower
4/5 (728 Views . 28 Votes)
Mapelastic AquaDefense may be applied on: • concrete; • cementitious screeds and screeds made using special binders (Topcem, Topcem Pronto, Mapecem or Mapecem Pronto); • plasterboard (for internal applications only); • existing coatings in ceramic, terrazzo and stone; • cementitious render.

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Just so, can you use AquaDefense on drywall?

No. AquaDefense is not approved for showers constructed with drywall.

Similarly, can you tile over Mapei AquaDefense? Cement-based thin-sets – such as MAPEI's Ceramic Tile Mortar, Ultraflex 1, Porcelain Tile Mortar and Ultraflex 2 – can be installed when Mapelastic AquaDefense turns to a dark green color (typically after 30 to 50 minutes).

Regarding this, how do I use Mapei AquaDefense?

Apply Mapelastic AquaDefense liquid 6" (15 cm) on both sides of the cracks, control joints, corners and coves, using a paintbrush. Let dry to a dark green color. 2. Apply 2nd coat and let dry.

Can you paint over Mapei AquaDefense?

Mapelastic AquaDefense can be applied with a paint brush or 3/8" nap paint roller.

27 Related Question Answers Found

Does tile stick to RedGard?

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.

What is AquaDefense?

Mapelastic AquaDefense is a premixed, advanced liquid-rubber, extremely quick-drying waterproofing and crack-isolation membrane for installation under ceramic tile or stone in residential, commercial and industrial environments.

Can I use regular drywall in bathroom?

You can hang drywall in the bathroom but not the same type that you hang in the rest of the house. Bathroom drywall must be moisture-resistant, and it's colored green to distinguish it from the regular variety. It isn't appropriate for areas that actually get wet, however, such as shower and tub surrounds.

Do you have to waterproof Hardibacker board?

In fact, it can be submersed under water indfinitely and maintain its structural integrity. However, when a product is characterized as "water resistant," it means it is impermeable, able to repel water. Most concrete backer-boards on the market today are not water-resistant, but all are waterproof.

Can you use RedGuard on drywall?


It's true that RedGard can be used on drywall, but when all their product information is carefully considered, it is not the case that RedGard can be used on Drywall in a wet area. As far as I can tell, there is no industry standard that supports the use of a liquid membrane on drywall in a wet area.

Do I need to waterproof shower walls before tiling?

Prepping for shower tile is different than the prepping for tile on drywall. A shower is considered a wet application, so you need to waterproof the foundation, which you'll learn how to do in these instructions. After the waterproofing step, the instructions are the same as if you were installing tile on drywall.

Can you paint over waterproof membrane?

As long as you use a good primer, you should be OK, though. You can apply thinset over the RedGard and prime and paint over that.

What is mapelastic AquaDefense?

Mapelastic AquaDefense is a premixed, advanced liquid-rubber, extremely quick-drying waterproofing and crack-isolation membrane for installation under ceramic tile or stone in residential, commercial and industrial environments.

What is Red Guard waterproofing?


RedGard Waterproofing and Crack Prevention Membrane is a ready-to-use, liquid formula that creates a seamless waterproof barrier and prevents common cracks from occurring in tile, stone and grout. RedGard is easy to apply and dries quickly.

Will Thinset stick to Aquadefense?

Aquadefense is a great waterproofing product. Thinset mortar will adhere to it that's what it's specifically manufactured for. It requires the use of a polymer modified / latex modified thinset mortar. Check out the library shower construction thread to make sure that you built your shower correctly so far.

Is Aquadefense paintable?

since you are not installing tile over it, it can be painted with a latex paint. Welcome, Katherine. Redgard is designed to be covered with tile or stone within 72 hours of installation. It is not meant to be left unprotected and latex paint is not gonna be considered a suitable protection.

How do I use Mapei Primer G?

Dilute Primer G with water from 1:1 to 1:3 to protect old floors before levelling, to fix the residual dusting and to provide even absorption of substrates prior to levelling or laying. Apply on perfectly dry gypsum or anhydrite surfaces (residual moisture content less than 0.5%).

Does 100% silicone stick to RedGard?

When the mortar is cured, run a small bead of silicone to seal between the tub and the tiles. DO NOT use thinset in that gap. Caulk that gap with siliconized or latex caulk and then use Redgard over the caulk. Regard will not stick to 100% silicone caulk.

Does Thinset absorb water?


Cement board, backer board, thinset mortar, tile, grout and sealers aren't waterproof. Some tile absorbs very little, while grout and natural stone are porous as a sponge.

Does cement board wick water?

If you use cement backer board, you have to install a separate moisture barrier between the board and any wood it's attached to. Since the concrete can absorb and wick moisture, the barrier prevents wood rot if the backer board gets saturated with water.

Does Thinset adhere to silicone?

Furthermore, thinset will not adhere to silicone.