Webertherm Prime Plast
Webertherm Prime Plast is a cement-based, polymer-modified base coat render designed for application over XPS and EPS thermal insulation boards. Used as an intermediate layer in exterior thermal insulation systems, it is widely preferred in professional applications due to its high adhesion strength, smooth surface finish, and excellent thermal resistance.
Playing a critical role in ensuring the durability and longevity of thermal insulation systems, Webertherm Prime Plast creates an ideal substrate for decorative finishing coats.
What is Webertherm Prime Plast?
Webertherm Prime Plast is a:
- Cement-based render
- Polymer-modified formulation
- Product specially developed for thermal insulation systems
- Thin-layer application mortar
It is a high-performance surface render designed to protect insulation boards against external factors, create a smooth surface, and provide a strong base for finishing coatings.
Areas of Use
Webertherm Prime Plast is used in:
- XPS thermal insulation boards
- EPS thermal insulation boards
- Exterior thermal insulation systems (ETICS)
- Wall surfaces of all building types
As an intermediate layer within thermal insulation systems, it improves both mechanical strength and finishing coat performance.
Key Advantages
High Adhesion Strength
Provides excellent bonding to XPS and EPS surfaces, maintaining the integrity of the insulation system.
Resistance to Thermal Shock
Maintains its stability and performance even under sudden temperature fluctuations.
Smooth and Uniform Surface
Creates an ideal substrate for decorative finishing coats and exterior facade coverings.
Easy Application
Its extended working time allows for comfortable, controlled, and efficient application.
Technical Specifications
- Application temperature: +5°C to +30°C
- Pot life: Approximately 3 hours
- Total application thickness: 4 mm
- Maximum thickness per coat: 2 mm
- Waiting time between coats: 3–4 hours
- Waiting time before finishing coat application: Minimum 7 days
Application Guidelines and Important Notes
- The substrate must be sound, clean, and load-bearing.
- Do not apply on weak or low-strength surfaces.
- Avoid application under direct sunlight, strong wind, or excessively hot conditions.
- Follow the recommended layer thicknesses and waiting periods.
- Allow a minimum curing period of 7 days before applying the finishing coat.
Compliance with these recommendations is essential for achieving a durable and long-lasting insulation system.
Conclusion
Webertherm Prime Plast is a reliable and professional solution that delivers maximum performance during the base coat stage of thermal insulation systems. Thanks to its strong adhesion to XPS and EPS boards, smooth surface finish, and resistance to external conditions, it ensures long-lasting and durable results in exterior facade insulation applications.
Frequently Asked Questions (FAQ)
On which surfaces can Webertherm Prime Plast be used?
It is designed for use as a base coat render on XPS and EPS thermal insulation boards.
What is the recommended application thickness?
The total thickness should be 4 mm, with a maximum of 2 mm applied per coat.
How long should I wait before applying the finishing coat?
A minimum curing period of 7 days is required before applying the finishing coat.
Can it be applied to weak substrates?
No. The substrate must be sound, stable, and load-bearing.
How is its adhesion performance?
It provides excellent adhesion to both XPS and EPS insulation board surfaces.