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The NHBC’s decision that vapour permeable underlays require supporting high level ventilation illustrated the extent to which condensation in the roofspace has become a problem. Roof ventilation specialist Klober’s ‘Condensation Risk Analysis’ service has therefore become a highly valuable resource as specifiers design ever more airtight buildings. The drive towards thermally efficient construction has made the need for balanced roof ventilation more important than ever as Klober Technical Manager Graham Copson commented “Demand for such information has grown with increased use of ‘non-ventilated’ systems and despite the NHBC ruling the need to assess potential condensation risk is no less critical. Heavy levels of vapour are being created in short periods after which homes are often left unheated for long periods. If ceilings are not adequately sealed moisture carried by warm air is certain to condense”.