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Roof Insulation Moisture: How Prevalent is it and Does it Really Matter?

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Doubletree Tukwila

16500 Southcenter Parkway

Tukwila, WA 98188

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Abstract:


Short Answer: Yes, moisture in roof insulation matters. Excessive moisture can affect R-values,
potentially degrade materials, and lead to organic growth. If a path to the interior of the building is
present, indoor air quality can be affected, condensation can drip to the interior, and degradation of
structural elements is possible. On the other hand, there is always a measureable amount of moisture
within roofing assemblies and sometimes the problem can be overstated.


In this presentation, WJE will present case studies of existing buildings where condensation under and
within roofing assemblies was excessive. Moisture monitoring devices installed long term in some of
these buildings recorded moisture levels over time. Before and after data will be presented that
demonstrates the effectiveness of added roof insulation, HVAC adjustments, and/or modification of
heating systems. To compliment this data, we will also provide examples of other moisture detection
techniques including, infrared imaging, high and low voltage leak detection, capacitance meters, and
gravimetric analysis.


Objectives:
1. Identify problems related to excessive moisture in roofing assemblies
2. Evaluate techniques used to measure moisture below and within roofing assemblies
3. Evaluate solutions to moisture issues.
4. Explore the future of moisture measurement within roofing assemblies


Bio: Wade Vorley is an architect and registered roofing consultant at Wiss,
Janney, Elstner Associates (WJE). He has a master’s degree from UC Berkeley,
focuses on building envelope investigation and design; and provides condition
surveys, field investigations, repair designs, peer reviews, and litigation support.
Mr. Vorley is published in trade journals, presents AIA accredited seminars, and
conducts research. He writes technical papers including one presented at the
2011 NRCA International Roofing Symposium in Washington, D.C., and one at
the 2013 Waterproof Membranes Conference in Dusseldorf, Germany. Prior to joining WJE, Mr. Vorley
worked as a roof installer, supervisor, project manager, and cost estimator for a roofing contractor in
the Pacific Northwest.

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Date and Time

Location

Doubletree Tukwila

16500 Southcenter Parkway

Tukwila, WA 98188

View Map

Refund Policy

Refunds up to 7 days before event

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