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Klober’s newly certified CPD presentation 'The Code for Sustainable Homes and airtightness in roofs' examines how best to 'build tight and ventilate right' within the realms of practical pitched roofing construction. It explains the contribution of airtightness within the 9 categories of Code assessment, together with the role of air barriers and vapour control layers (AVCLs) and vapour permeable roofing underlays. Principles of air tightness, air leakage paths and Building Regulation variations are examined together with factors such as Dwelling and Target Emission Rates and environmental impact of materials.