While Earthaus Tadelakt is naturally water-resistant, it is not a waterproofing system. A proper waterproof membrane must always be installed beneath the Tadelakt finish in any wet-area application, including showers and bath enclosures.
Understanding Tadelakt's Water Resistance
Tadelakt is a lime-based plaster that becomes water-repellent when compressed and sealed with Olive Oil Soap. This chemical reaction creates a hydrophobic surface that allows water to bead and run off.
Important distinction:
Water-resistant: Repels surface moisture and sheds water effectively.
Waterproof: Fully prevents moisture penetration through to the substrate.
Why it matters: Tadelakt protects against splashing and humidity, but without a proper membrane, prolonged moisture exposure could eventually migrate into the substrate, causing damage behind the finish.
Role of a Waterproof Membrane
A waterproof membrane serves as the primary moisture barrier within a Tadelakt system for showers and other wet areas. It ensures that even if minor cracks or imperfections develop in the plaster, no water reaches the underlying structure.
Requirements:
Always install a code-approved waterproof membrane behind the Tadelakt finish.
The membrane should be rated for shower or wet-area applications.
Follow all local building codes and manufacturer instructions for installation.
Summary of Best Practice
Tadelakt = aesthetic, water-resistant surface layer
Waterproof membrane = primary waterproofing protection
Both are required for proper performance in showers, steam rooms, and other wet environments.
Questions? Email support@earthausplaster.com or text 1-800-917-2414.