Knauf ThroughWall
Our complete one-brand BBA-certified infill panel system
Do you have a question?
Get in Touch
ONE SYSTEM, ONE BRAND, ZERO COMPROMISE
Traditionally, external infill solutions comprised of components drawn together from across different suppliers and brands. Aside from compromising design integrity, this approach burdens designers and contractors with complexities around compatibility and performance test data, not to mention pricing fluctuations and logistics challenges. Compromises are inevitable, but not with Knauf ThroughWall.
Knauf's ThroughWall system is different. Each component perfectly complements the rest of the system. There's no margin for error and no compromises.
All you need to specify your project
A FULLY ACCREDITED EXTERIOR WALL INFILL SYSTEM
Because we control the entire design and manufacturing process, there's no compromising on test data either. By testing components individually and as a complete system, the integrity of our test data simply cannot be matched. We are proud to offer the Knauf ThroughWall system with full BBA certification (number 20/S046). Knauf also have several standalone product BBA Certifications including Knauf Windliner Sheathing Board (17/5442) and Knauf Insulation Rocksilk® RainScreen Slab (19/5609).
Knauf ThroughWall System
1. External Insulation
Knauf Insulation Rocksilk® RainScreen Slab
2. Sheathing Board
1 x 12.5mm Knauf Windliner
3. Infill Insulation
Knauf Insulation OmniFit® Slab 35
4. Steel Frame
Knauf Steel Frame System (SFS)
5. Internal Plasterboard*
2 x 12.5mm Knauf Fire Panel or 2 x 15mm Knauf Fire Panel
Product variants
Product | Fire Resistance | Sound Insulation | Certification | U-Value |
|---|---|---|---|---|
2 x 12.5mm Knauf Fire Panel | BS EN 1364-1 EI90 min (Inside to Outside) EI120 min (Outside to Inside) | BS EN ISO 10140-2 53-61dB** | BBA approved | BS EN ISO 10211, BR443 0.19-0.32 W/m2K |
2 x 15mm Knauf Fire Panel | BS EN 1364-1 EI120 min (Inside to Outside) EI120 min (Outside to Inside) | BS EN ISO 10140-2 53-61 dB** | BBA approved | BS EN ISO 10211, BR443 0.20 W/m2K |
*Vapour control/barrier layers may be required. This is determined by condensation risk analysis and project requirements.
**Acoustic performance based on combination of all Knauf ThroughWall products types and sizes.
Note: System performance based on imperforate system. Where openings, service penetrations are installed, this will need to be independently assessed.
Knauf’s SFS full design service as part of the ThroughWall and external steel framing offering gives you end-to-end expert support from concept through to delivery, ensuring your SFS design is engineered, detailed and documented right first time. Knauf’s experienced design team will review architectural and structural inputs, create bespoke full SFS design drawings (including calculation packs and material measures), produce clear 2D/3D drawings and coordinate components for tender and construction use, and work with you to optimise performance, compliance and buildability — all backed by the technical support and system data you need to reduce risk and streamline delivery.
ThroughWall Case Studies
Learn more about how our Knauf ThroughWall has been utilised in these large projects.
FREQUENTLY ASKED QUESTIONS
ThroughWall is Knauf’s fully tested, one-brand exterior infill wall system. It combines sheathing, insulation, steel framing and internal boards into a single, BBA-certified solution designed to deliver trusted safety.
Traditionally, infill walls pull components from multiple brands, creating risks around compatibility, test evidence, pricing and logistics. Knauf ThroughWall is a single, integrated system where every component complements the rest - reducing complexity and eliminating compromise.
Yes. Knauf ThroughWall holds full BBA certification: 20/S046. Additional product BBA certifications include Knauf Windliner Sheathing Board (17/5442) and Knauf Insulation Rocksilk RainScreen Slab (19/5609).
Yes. ThroughWall is suitable for use in buildings in excess of 18 metres, subject to the overall external wall design - including the chosen cladding meeting required testing and regulatory requirements.
Vapour control/barrier layers may be required. This is determined by condensation risk analysis and project requirements.
System performance data is based on an imperforate wall. Where openings or service penetrations are present, they must be independently assessed and detailed to maintain fire, acoustic and thermal performance.
Yes. ThroughWall is designed to integrate with Knauf interior solutions across drywall, ceilings and floors to deliver a consistent, compliant system from envelope to interior.
Yes. ThroughWall is designed to integrate with Knauf interior solutions across drywall, ceilings and floors to deliver a consistent, compliant system from envelope to interior.
Knauf’s ThroughWall system plays a valuable role in supporting golden thread principles by delivering a fully defined, performance-tested external wall solution that simplifies compliance, coordination, and record-keeping. By integrating compatible components, verified fire and acoustic performance and standardised details within a single system framework, it can reduce design risk, enhance traceability, and provide clear documentation from specification through to installation.
Yes - Knauf warrants that its Systems will perform to the specified requirements throughout the lifetime of the building, when installed properly and under normal conditions. Find out more about our 100% Knauf System Performance Warranty.
Support you can rely on
From design to project completion, Knauf's product and support teams are here to help. To learn more about Knauf ThroughWall, or pick our brains on a particular problem, you can drop us a line.