Hi Emma,
I would suggest, How to define a proposed cavity a ventilated, slightly ventilated or unventilated. How and when a low-e value can be use in U-value calculation? May be worth reading the report ‘Ventilation of the Cavities in Timber Framed Walls C H Sanders, Centre for Research on Indoor Climate and Health School of Engineering, Science and Design Glasgow Caledonian University’before the discussion.
Thanks
Umi
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