E2 and E2/AS1
When it comes to weathertightness, Building Code Clause E2 External moisture and the compliance document E2/AS1 are the critical documents for any designer.
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When it comes to weathertightness, Building Code Clause E2 External moisture and the compliance document E2/AS1 are the critical documents for any designer.
Weathertightness failure of a building’s exterior cladding results in water penetrating the cladding and entering the exterior wall assembly. This water needs a path to get out again.
Auckland tops the list of active claims with the Weathertight Homes Resolution Service. New applications continue to be lodged, some encouraged by the new government assistance package.
A large proportion of weathertightness building failures have resulted from insufficient maintenance – some could have been avoided if owners had been better informed.
Identifying defects, accurately estimating costs and remedial work that reveals other problems are just some of the challenges the industry has to grapple with as the leaky building crisis plays itself out.
Over the last 9 years, the leaky building crisis has filled numerous press columns. We consider the government’s rescue package along with some recent developments in case law.
It is imperative that the building industry works closely with homeowners not just on remediating leaky homes but in forging the way forward for the industry and its customers.
BRANZ has been working with European experts to adapt moisture modelling software to New Zealand conditions and create a tool that will benefit ongoing weathertightness projects.
Detailed information is needed before a decision can be made on the best strategy for the remediation design of a leaky building.
Following the 4Ds principles will ensure that construction is robust and durable and will manage any water that impacts upon the building or penetrates the exterior cladding.