• GRAHAM FINCH
    RDH Building Science
  • ROBERT LEPAGE
    RDH Building Science
  • LORNE RICKETTS
    RDH Building Science
  • JAMES HIGGINS
    RDH Building Science
  • MARCUS DELL
    RDH Building Science

Over the past several years in the Pacific Northwest, there has been a trend toward increased reporting and repair of moisture problems within attics below sloped wood-frame roofs. The problem consists of seasonally wetted roof sheathing and mold contamination occurring within the wood-frame attics of many newer houses, townhouses, and multifamily building complexes. This study investigated possible causes, including sheathing moisture absorption caused by night sky cooling and ventilation air condensation, as well as the impact of shingle underlayment types on potential exterior moisture sources.

This paper was presented at the 2015 RCI International Convention and Trade Show.

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