Roofs and walls of cold-storage buildings need to provide good thermal resistance and robust resistance to water vapor transmission. Insulated metal panels (IMP) do just that. As manufactured, IMP are perfect vapor barriers. The joints between IMP and flashings to adjacent insulated roofs? Not so much.

They often rely on near-perfect application of literally miles of sealants. When exterior air or rain finds a way in, it condenses on the first cold surface it contacts. The condensed water accumulates until it drips inside or forms ice.

In his latest seminar, titled Cold Storage Condensation Challenges and Cures, VP and Senior Project Manager Phil Dregger will share insights gleaned from investigating and repairing several large cold-storage buildings with IMP walls and insulated metal decks.

About the Presenter

Phil is a professional engineer and registered roof consultant with more than 35 years of experience. With special expertise in wind, building codes, solar PV, and condensation, Phil is a recognized expert in roof technology and has numerous industry articles and speaking appearances in his name. He has received the ASTM D08 William C. Cullen Award and the IIBEC/RCI Lifetime Achievement Award

Learning Objectives

To provide attendees a practical understanding of the following:

  1. The non-intuitive hygrothermal physics of cold storage buildings (e.g., cold air sinks).
  2. Common air/water intrusion pathways (e.g., IMP side laps, roof to IMP flashings, IMP penetrations).
  3. The importance of remembering that most IMP allow exterior air and rain to flow freely up and down side laps; outboard of the primary joint seal but hidden by the panel interlock.
  4. The right and wrong places to install vapor barriers in roofs over cold storage.
  5. How to promote “drying” of condensed water and small rain leaks to the inside.
  6. A novel repair technique using reinforced fluid-applied flashings in lieu of conventional sheet membrane flashings at terminations and transitions.


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