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As the foam is a superior insulant, coupled with just 100mm of insulation at joist level, your roof will also meet the stringent thermal performance standards required for a new home.
Most homes now have some form of lost insulation, as a result of Government campaigns and gradually improving Building Regulations, but in many cases it will be less than the current minimum requirement for new homes, of a 100mm thick layer of glass fibre or a similar insulant.