DaveH Posted January 22, 2019 Posted January 22, 2019 My roof makeup is 150x50mm rafters, breathable felt, 50x25 battens and natural slates with a dry ridge system. Underneath the felt I will leave a 50mm air gap and then 100mm Kingspan. The SAP calcs then call for insulated plasterboard underneath this. Will I need a separate VCL or will the foil covered Kingspan with taped joints be sufficient? Do I need to install soffit vents or will the breathable felt and dry ridge be adequate for ventilation? Thanks
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