CWCT Testing

Independent on-site performance testing of curtain walling, windows and façade systems, including water penetration, air permeability and structural performance testing where required, using relevant CWCT test methods.

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When You Need CWCT Testing

CWCT testing may be appropriate where the in-service performance of a façade system needs to be verified, including:

  • New-build or refurbishment projects approaching practical completion
  • Verification of repaired or replaced façade sections
  • Reported water ingress or suspected weather-tightness problems
  • Warranty or defects investigations where independent performance evidence is required
  • Contractual or construction disputes involving façade performance
  • Further investigation following a curtain walling or façade condition survey

CWCT Testing Scope & Methodology

Testing is selected according to the façade system, project requirements and suspected performance issue and may include:

  • Water penetration testing using appropriate CWCT test methods
  • Air permeability testing of windows or façade systems
  • Structural and wind load testing where required
  • Testing at representative locations and areas of known or suspected failure
  • Recording of test pressures, durations, observations and results
  • Diagnostic investigation to help identify the likely source of failure where a test does not achieve the required performance

Deliverable

  • Detailed CWCT test report
  • Test methodology, locations, pressures and results
  • Photographic evidence of test locations and findings
  • Clear assessment against the applicable project or CWCT performance criteria
  • Diagnostic recommendations where testing identifies a failure

Process & Timeline

  1. Initial scoping — establish the façade system, required test type and project requirements
  2. Test planning — determine test locations, access and equipment requirements
  3. Site testing — carry out the agreed performance tests
  4. Analysis — assess results against the applicable criteria
  5. Reporting — issue the test report with results and recommendations

The scope and timescale depend on the façade system, number of test locations, access requirements and types of testing required.

Standards and Competence

  • Relevant CWCT guidance and standards for curtain walling and building envelope systems
  • Applicable project specifications and manufacturer installation requirements
  • Relevant British and European standards where applicable
  • Testing undertaken to appropriate CWCT methodologies where included within the scope
  • Assessment undertaken by façade professionals experienced in curtain walling systems

Who Commissions CWCT Testing

CWCT testing is commissioned by organisations responsible for the construction, ownership or management of buildings, including:

  • Developers and main contractors
  • Building owners and landlords
  • Property managers and managing agents
  • Facilities and asset managers
  • Employers and project management teams
  • Housing associations and social landlords
  • Other organisations requiring independent façade performance testing

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FAQS

Depending on the façade system and requirements, testing can include water penetration, air permeability and structural performance testing. The appropriate tests are agreed during scoping.

It assesses the ability of the tested façade or component to resist water penetration under specified test conditions. The applicable test pressure, duration and acceptance criteria depend on the system and project requirements.

There is no single number that applies to every project. Test locations are selected based on the façade system, building size, project requirements and known or suspected problem areas.

Yes. A Curtain Walling Survey assesses the installed condition against available design and manufacturer information, while CWCT testing provides evidence of actual in-service performance. The two services can be commissioned together where both installation and performance need to be assessed.