For over 20 years, Trinity|ERD has maintained its reputation as one of the most experienced, innovative and knowledgeable building envelope consulting firms in North America. We provide services including building envelope investigation, design / specification, field testing, construction observation, litigation support, and system / product development to a wide variety of clients.

With two offices Trinity|ERD is able to provide whole roofing and waterproofing solutions to a range of issues related to the exterior building envelope.

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Contact Us by phone at (206) 467-0054 or at email

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Subscribe to the Trinity | ERD newsletter "Pushing the Envelope: A Monthly Journal of Issues Concerning Building Design, Science, and Litigation."