FAQ | Mapei

After creating a slope with a fresh mud bed using MAPEI's 4 to 1 Mud Bed Mix, the area should be allowed to cure for at least 24 hours per inch (centimeter) plus one day before application of MAPEI's Mapelastic AquaDefense. For example, if the mud bed is at 2" (5 cm) depth at its highest level, then you must wait three days before the application of Mapelastic AquaDefense. Curing time is based on a temperature of 73°F (23°C). Cooler temperatures will require longer curing times. If your project is on a fast track, consider Planislope RS mortar, which can receive waterproofing in a matter of hours.

Surface Preparation Requirements Reference Guide RGT0309

Learn more

Why isn't Mapelastic AquaDefense membrane bonding to the cement board?

New cement board will often come with a fine dust on the surface of the board. So, it is very important to clean the surface of the cement board and to allow the surface to dry before applying Mapelastic AquaDefense. Usually, wiping the cement board with a damp (not wet) sponge will effectively remove the dust.

Where to Buy

Learn more

Why is Mapelastic AquaDefense membrane taking so long to dry?

When applying MAPEI's Mapelastic AquaDefense, it is important to allow it to dry in between coats. It is also important to avoid applying Mapelastic AquaDefense too thick. When applying Mapelastic AquaDefense over a mud bed, the mud bed must be dry before application. After using MAPEI's 4 to 1 Mud Bed Mix, the area should be allowed to cure for at least 24 hours per inch (centimeter) plus one day before application of Mapelastic AquaDefense. For example, if the mud bed is at 2" (5 cm) depth at its highest level, then you must wait three days before the application of Mapelastic AquaDefense. Curing time is based on 73°F (23°C). Cooler temperatures will require longer curing times. If your project is on a fast track, consider Planislope RS mortar, which can receive waterproofing in a matter of hours.

Where to buy

Can I use Mapelastic AquaDefense membrane to bridge the gaps between cement boards?

It is important for cement board (and fiber cement board) to be installed in strict accordance with the written instructions of the board manufacturer. This typically includes taping the corners and seams with mesh tape and covering the tape with a polymer-modified, cement-based tile mortar. MAPEI's Mapelastic AquaDefense should not be used to replace this critical step or bridge the gaps between cement board.

Where to Buy

Learn More

How soon can I apply Mapelastic AquaDefense membrane over properly taped corners?

After treating corners and seams of cement board with mesh tape and a polymer-modified, cement-based tile mortar, the area should be allowed to cure for at least 24 hours before the application of MAPEI’s Mapelastic AquaDefense. Note: If time is an issue, use a MAPEI rapid-set, polymer-modified mortar with the mesh tape and allow the area to dry for at least four hours before the application of Mapelastic AquaDefense.

Where to Buy

Learn more

Which tile mortars are recommended over Mapelastic AquaDefense membrane?

For tile and stone installations, use a MAPEI polymer-modified mortar meeting ANSI A118.4, ANSI A118.11 or ANSI A118.15, or an epoxy mortar meeting ANSI A118.3. For the installation of resilient flooring over Mapelastic AquaDefense, adhere to the adhesive recommendations or limitations for use over nonporous substrates.

Where to buy

Learn more

FAQs

FAQs

Select a product line

Select a product category

Select a topic

Topic Questions

Keep in touch