Exova investigated the reasons of failure

The cladding division of Exova (previously Bodycote Testing) was appointed to investigate the reasons of failure and to advise on the acceptability of corrective measures proposed by the contractor.

Scope

Investigation revealed a weak interface between the concealed windows within the façade and its surrounding support frame. This meant that humid air from the exterior was entering into the cavity between the concrete walls and the metal back-pan of the façade. This humid air, cooled by the building air conditioning was condensing onto the building walls which were coated with bitumen based paint and running down the walls potentially staining the internal finish.

An on-site water hose test was performed to confirm the findings and remedial works were performed for the whole building under Exova’s supervision and subsequently on-site hose tests (AAMA 501.2 test) were performed successfully.

Benefits of testing / reviews

The cost for review and testing at the early stages of the project was much more cost effective than performing rectification works on a completed building.