CWCT Tested – Trusted with Confidence
- Read time: 3.5 minutes
- Date: 04 Feb 2026
Fixfast is proud to confirm that its façade support system has successfully completed an intensive and comprehensive series of independent tests to the Centre for Window and Cladding Technology (CWCT) Standard for Systemised Building Envelopes — Sequence B. The tests replicate extreme, real-world environmental forces that a façade may experience over many years, and deliver robust proof of performance for specifiers, architects and contractors alike.
CWCT testing is widely recognised as one of the most demanding and thorough test regimes for building envelopes. It combines multiple performance criteria into a single sequence to ensure that systems are not just structurally sound, but also airtight, watertight, wind-resistant and impact-resilient under both static and dynamic conditions.
What the CWCT Sequence B Test Regime Covers
The CWCT Sequence B testing process includes the following key performance assessments:
Airtightness (Air Permeability — Infiltration & Exfiltration): Measures how much air passes through the façade under both positive and negative pressures, indicating the ability of the system to minimise unwanted airflow and heat loss.
Watertightness – Static and Dynamic: Tests resistance to water penetration under increasing static pressure and under dynamic conditions that simulate wind-driven rain — including the use of high-velocity airflow.
Wind Resistance: Evaluates structural performance under both serviceability loads (representative of regular gusting winds) and safety loads (extreme pressures). The Fixfast Test Rig also underwent an additional cyclic wind test representative of UK wind loads over a 50-year period.
Impact Resistance: Assesses how the system withstands both soft and hard body impacts, ensuring that panels, rails and fixings resist accidental strikes without compromising integrity or safety.
Repeat Testing: Many tests — such as infiltration and static watertightness — are repeated at later stages to check that performance remains consistent after the system has been stressed.
In essence, the CWCT Sequence B standard subjects façade systems to air leakage, rain penetration, severe wind pressures, repeated loading cycles and impact forces, all before dismantling and inspection to confirm long-term resilience.
Most importantly, Fixfast passed all Sequence B tests with flying colours, meeting or surpassing every criterion within this stringent test sequence.
Proven Durability with Cyclic Wind Resistance
In addition to the standard Sequence B regime, independent testing also included cyclic wind assessments, which simulate repeated positive and negative wind pressures over extended cycles — a critical test for long-term durability. The Fixfast façade support system passed these cyclic wind protocols as well, showing no loss of performance even after extensive repeated loading.
What does it mean to you?
CWCT testing is vital for rainscreen helping hand systems because it validates that the brackets and rails can handle intense wind loads without compromising the building's structural integrity. If you’re a specialist subcontractor, CWCT type test reports can provide the technical "deemed to satisfy" evidence needed to technically justify a proposed cladding support solution. If you’re a main contractor or a building owner, you will benefit from knowing that a tried and tested solution is being utilised, reducing the risk of latent defects and potential remedial costs.
