Hygrothermal assessment of north facing, cold attic spaces under the eaves with varying single sided passive ventilation strategies and infiltration scenarios, in a cool, temperate climate

Nickolaj Feldt Jensen, Søren Peter Bjarløv, Christopher Just Johnston, Casper F. H. Pold, Morten Hjorslev Hansen, Ruut Hannele Peuhkuri

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

Relative humidity and temperature were measured in cold attic spaces under the eaves with diffusion-open roofing underlay to investigate different ventilation strategies, the influence of infiltration, and exterior insulated roofing underlay. The project was carried out as a full-scale experimental setup in the cool, temperate climate in Lyngby, Denmark. The objective was to test if the best practice recommendations concerning design of the cold attic space will prevent damaging moisture levels in the attics. Measurements do however indicate that complying with recommendations will not ensure satisfactory moisture levels in the attic spaces. A comparison of the passive ventilation strategies in combination with varying infiltration rates, for attic spaces fitted with diffusion-open roofing underlay, indicate that attic ventilation increases moisture levels. The exterior insulation of the attic space improved the hygrothermal performance.
Original languageEnglish
Publication date2018
Number of pages6
Publication statusPublished - 2018
Event7th International Building Physics Conference - Syracuse, United States
Duration: 23 Sep 201826 Sep 2018
http://ibpc2018.org

Conference

Conference7th International Building Physics Conference
Country/TerritoryUnited States
CitySyracuse
Period23/09/201826/09/2018
Internet address

Keywords

  • Cold attics
  • Ventilation
  • Diffusion-open roofing underlay
  • Insulated roofing underlay
  • Moisture

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