muro san duo Sanierputz WTA - Renovation Plaster for Damp Masonry (20kg)

muro san duo Sanierputz WTA und Dämmputz is a professional-grade renovation plaster specifically engineered for treating and protecting moisture-damaged masonry in historic and traditional buildings. This pore-hydrophobic and highly diffusion-capable plaster creates permanent solutions for damp walls, salt efflorescence, and deteriorating plasterwork.

Key Features

• Pore-Hydrophobic: Water-resistant surface prevents liquid water penetration while allowing vapor transmission
• Diffusion-Capable: Highly breathable formulation allows trapped moisture to escape naturally
• WTA Certified: Complies with Wärmeschutz-Technische Analyse standards and DIN 18 557 / DIN 18 550 Mortar Group P II
• Salt-Resistant: Prevents salt efflorescence and plaster delamination on affected masonry
• Excellent Workability: Easy machine and hand application with strong adhesion
• Insulation Properties: Contributes to thermal performance of treated walls
• Ready-to-Use: Dry mortar formulation - simply add water to correct consistency

Applications

• Permanent plastering of damp, salt-laden masonry
• Renovation of moisture-damaged walls in historic buildings
• Treatment of cellars and vault spaces with rising damp
• Post-flood remediation and water-damage restoration
• Surface treatment following horizontal damp-proof course installation
• Prevention of salt crystal growth and efflorescence
• Breathable facade restoration on traditional buildings

Technical Specifications

Standards & Certification: DIN 18 557, DIN 18 550 (Mortar Group P II), WTA approved
Type: Ready-to-use dry mortar - pore-hydrophobic and diffusion-capable
Composition: Specially formulated cement mortar with water-repellent and workability enhancers
Product Code: 02056
Package: 20kg bag
Color: Light grey
Coverage: Approximately 1.5-2 m² per 20kg bag at 10-12mm thickness (varies with application method and substrate)
Application Thickness: First coat 10-15mm; finishing coat 5-10mm
Application Temperature: Minimum 5°C; optimal 15-25°C
Drying Time: Approximately 7-10 days depending on temperature and humidity
Water Addition: 9.5-11 liters per 20kg bag (mix to desired consistency)
Storage: Store in cool, dry conditions; shelf life 12 months in original sealed packaging

Substrate Preparation

• Remove any loose, flaking, or delaminated plaster
• Clean masonry surface thoroughly - remove dust, algae, and contaminants
• Dampen substrate (but not saturated) before application for optimal adhesion
• Ensure adequate substrate salinity assessment before treatment
• For optimal results, follow WTA guidelines for comprehensive damp treatment
• Consider installing horizontal damp-proof course before plaster application for rising damp issues

Application Instructions

1. Mix Thoroughly: Add 9.5-11 liters clean water to 20kg bag. Mix with mechanical mixer or by hand until uniform mortar consistency is achieved. Allow 10-15 minutes rest, then remix before application.
2. Prepare Substrate: Clean and dampen masonry surface. Remove any loose material or previous failed plaster coatings.
3. Apply First Coat: Apply 10-15mm thickness using trowel or spray application. Work in sections, maintaining edge control.
4. Cure First Coat: Allow 7-10 days drying between coats depending on temperature, humidity, and substrate porosity.
5. Apply Finish Coat: Apply final 5-10mm layer for smooth, durable surface finish.
6. Protection: Protect from rain for first 48 hours. Avoid application in frozen conditions or extreme heat.

Safety & Storage

• Contains Portland cement - skin and eye irritant. Avoid prolonged contact with skin.
• In case of skin contact, wash thoroughly with water.
• In case of eye contact, rinse immediately with clean water for at least 15 minutes.
• Wear appropriate PPE: gloves, eye protection, and dust mask during mixing and application.
• Use in well-ventilated areas.
• Store in cool, dry conditions (15-25°C). Protect from rain and excessive moisture.
• Keep in original sealed packaging. Once opened, use contents within reasonable timeframe.
• Keep away from children and pets.
• Refer to Safety Data Sheet for complete handling information.

Why Choose muro san duo?

muro san duo represents the gold standard in WTA-certified restoration plasters. Engineered in Germany to the highest standards, this product is trusted by conservation specialists, historic building contractors, and restoration professionals across Europe. Unlike traditional impermeable barriers or budget alternatives, muro san duo provides genuine, long-lasting protection while preserving the breathability of historic masonry—essential for the longevity of traditional buildings.

Made in Germany | WTA Certified | Professional Quality | Historic Building Approved