Vapor Permeance Testing with Dr. John Straube

Understanding the range of vapor permeance through wet cup and dry cup testing can help when selecting the right vapor permeance materials for your next building project.


Did you know that vapor permeance and vapor permeability mean two different things?

Dr. John Straube takes the confusion out of vapor permeance, a common topic in building science conversations, by explaining how it’s different from vapor permeability and what that means for builders as they choose the right materials for their project.

Dr. Straube takes us through the RDH Building Science Lab in Waterloo ON, where a variety of vapor permeance tests are being conducted and provides an in-depth look at the different types of vapor permeance testing, including the different types of materials and specimens. He also explains the range of permeance and why it’s an important factor when considering your wall, roof, or basement design.

About Dr. John Straube

Dr. John Straube

John Straube, Ph.D., P.Eng., is a principal at RDH Building Science Inc., where he heads forensic investigations and leads research projects in the areas of low-energy building design, building enclosure performance, hygrothermal analysis, and field monitoring of wall assemblies. He is also a prolific writer and a noted public speaker.

In addition to his work with RDH, Dr. Straube is a cross-appointed faculty member in the School of Architecture and the Department of Civil and Environmental Engineering at the University of Waterloo. Dr. Straube’s leadership as a building scientist and an educator has been recognized with multiple awards, including the Lifetime Achievement Award in Building Science Education from the National Consortium of Housing Research Centers (NCHRC) and the Professional Leadership Award from the Northeast Sustainable Energy Association (NESEA). Get the full scope of Dr. Straube’s work, awards, and contributions to the industry over at RDH.


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