Wraptite®, the only self-adhering vapour permeable air barrier certified by the BBA has successfully undergone independent testing to confirm its performance compliance with the requirements of the current standards on airtightness as outlined by the Centre for Window and Cladding Technology (CWCT).
Testing was carried out by Wintech Testing & Certification, an independent UKAS accredited testing laboratory and certification body. The test methods were based on the CWCT Standard Test methods for Building Envelopes - December 2005, section 5 for air leakage (infiltration & exfiltration).
Tests were carried out for both Air Leakage (Infiltration) and Air Leakage (Exfiltration). In all cases, the product passed the tests and achieved results which were significantly below the permissible values for air leakage as outlined in the CWCT standard. See Graph 1 - Air Permeability - Area.
By reducing the likelihood of potential failures to meet designed airtightness levels, the Wraptite System helps ensure “as-designed” performance, narrowing the performance gap between as-designed and actual energy performance.
Unlike internal air barriers, which can be complex and costly to install due to the need to accommodate building services such as electrical, lighting, heating and drainage systems, positioning the Wraptite air barrier on the outside of the structural frame also simplifies the process of maintaining the envelope’s integrity, as there are less building services and structural penetrations to be sealed.