Research data and supplementary files for the journal publication. The research project was co-funded by the Landowners' Investment Foundation (Grundejernes Investeringsfond) (GI) and supervised by Associate Professor Søren Peter Bjarløv.Status: FinishedEffective start/end date: 01/01/2014 to 01/01/2019 Supplementary data for: Nickolaj Feldt Jensen, Søren Peter Bjarløv, Christopher Just Johnston, Hygrothermal assessment of north-facing, cold attic spaces under the eaves with varying structural roof scenarios, 2019, Journal of Building Physics, Vol 44, Issue 1, pp. 3-36, https://doi.org/10.1177/1744259119891753 The dataset contains the following elements:1) Raw data_Phase12) Raw data_Phase1_Re-arranged3) Raw data_Phase24) Raw data_Pressure measurements5) Raw data_Tracer gas experiment6) Deriving process for Equation 87) Polynomial trendlines and flow relation8) Processed data_Phase29) Summary of key results10) Supplementary graphs for research article11) VTT mould model12) Final report on the "Ventilation conditions in cold attic rooms under the eaves in structures with diffusion-open roofing underlay, Phase 2", in Danish (Skunkrum etape 2 slutrapport)13) Short report with links to publications and project folders, in Danish (Skunkrum Etape 2 - kort rapport til GI + links