Klasse Group is proud to introduce its latest innovation in facade performance and compliance - The W1 and A1 tested glass fibre faced gypsum sheathing board system. Designed to meet the increasing demands of modern external wall construction, Klasse G-board has been independently tested to achieve W1, the highest standard for watertightness performance.
As facade compliance, durability and weather resistance come under greater scrutiny, architects, specifiers and contractors are demanding systems that are not only compliant, but proven. The Klasse W1 tested solution delivers exactly that, combining robust technical performance with practical installation benefits. At every stage of product development and system design, compliance is treated as a fundamental requirement rather than an afterthought. Klasse Group works closely with UKAS-accredited testing bodies and independent certification organisations to ensure systems are rigorously assessed against the latest industry standards and performance criteria.
For external wall systems in particular, compliance now extends beyond individual products; it is about how the complete wall build-up performs as a system. That is why Klasse Group invests heavily in testing, technical validation and ongoing product development, including watertightness, fire, structural and durability performance.
Achieving W1 status for the Klasse G-board system is a clear example of this commitment, demonstrating that the system has met the highest classification for watertightness performance under testing conditions.
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The W1 classification has become increasingly significant because it provides confidence that an external wall system can achieve the highest standard of watertightness performance. With greater scrutiny on facade design, build quality and long-term building performance, architects and specifiers are looking for independently tested systems that help reduce risk and improve durability.
Water ingress can lead to significant issues over the lifecycle of a building, including structural deterioration, internal damage, reduced thermal performance and costly remediation. A W1-tested system demonstrates that the wall build-up has been tested and shown to resist water penetration under severe exposure conditions effectively.
Alongside its W1 tested performance, Klasse’s gypsum sheathing board also offers a 12-month exposure guarantee, providing confidence during extended construction programmes and protecting projects from the challenges of unpredictable site conditions.
The Benefits
- W1 & A1 tested system performance
- 12-month exposure guarantee
- Excellent weather and moisture resistance
- Lightweight and easy to handle
- Can easily be cut and curved
- High dimensional stability
- Suitable for steel frame and timber frame applications
- Compatible with modern rainscreen facade systems
- Less Materials. Faster Installation. Reduced Labour Costs.
By integrating high-performance sheathing and watertightness capability into a fully tested system, Klasse helps streamline the facade build-up process. The result is a smarter specification solution that supports:
- Faster project delivery
- Reduced installation time
- Lower labour costs
- Greater specification confidence
Every project has different performance requirements, environmental conditions and design considerations, so selecting the correct system requires a collaborative and technically informed approach. Klasse Group works closely with architects, specifiers, facade consultants and contractors from the early design stages to understand the project’s specific needs, including exposure conditions, fire strategy, structural requirements, thermal performance and programme considerations.
Project Support
The technical team provides project-specific guidance and system recommendations backed by testing data, certification and compliance documentation. By combining tested system data, technical support and practical installation knowledge, Klasse Group helps clients reduce risk and achieve compliant, buildable and durable facade solutions.
The regulatory landscape is evolving rapidly, so ongoing education and technical support are essential. Klasse Group actively engages with architects, specifiers and contractors through CPDs, technical seminars, project consultations and regular industry updates to help keep them informed about changes to regulations, testing requirements and best practice guidance.
Technical sheets, specifications and product information are also available on our download centre and NBS Source, making it easier than ever for architects and specifiers to access the latest Klasse system information.
Klasse Group also offers full project support, including technical guidance and on-site demonstrations to show the best practice installation methods for the Klasse G-board system.
If you would like a project quotation to see how much money you could save on your next project, speak to the sales team today:
sales@klassegroup.co.uk
01432 842 030
