NEXUS focuses on the investigation, remediation of deficiencies, and failures in the built environment. We incorporate a working knowledge of proven thermal, air, and moisture barrier techniques into the forensic evaluation of the building envelope. Utilizing the latest forensic investigation methods and equipment, our building science experts provide insight into hidden or unforeseen conditions, potentially eliminating unnecessary repairs and construction schedule delays, and help identify overall cost savings, improve occupant comfort, and reduce building maintenance costs over the lifetime of the building.


Our certified thermographers utilize infrared (IR) thermography to identify sources of air leakage, water intrusion, and thermal performance of wall, roof, and floor assemblies. Infrared thermography has proven to be a priceless tool in evaluating the performance of building envelopes new and old.


NEXUS is again on the leading edge of the building envelope industry with the use of small unmanned air systems (sUAS), commonly referred to as drones. Utilizing the most current infrared thermography image specifically designed for drone use coupled with our customizable drone platforms, we can provide roof inspections, roof safety and access assessments, vertical cladding inspections and more from the safety of the ground and without costly man-lifts or dangerous botsun chairs. The image quality is exceptional and, when presented by our certified thermographers, can provide clients exceptional information on the condition of their buildings. This is just an example of the uses for drones we are constantly finding exciting and new uses for these phenomenal machines.


NEXUS staff has performed hundreds of air barrier tests for private and public (municipal, state, and federal) clients for more than a decade. Air Barrier testing per ASTM E-779 fulfills the requirements of the 2015 Washington State Energy Code, 2015 Seattle Energy Code, and the US Army Corps of Engineers. Pressure testing can also be used in conjunction with our infrared (IR) thermography images and theatrical smokers to pinpoint areas of potential air and water intrusion in the exterior building envelope prior to invasive exploratory investigations, many times replacing the need for cutting open the building.

Ken Rowan, Founding Principal of NEXUS, is a contributing editor for USACE Air Barrier Requirements and USACE Air Barrier Testing Protocol. Additionally, Mr. Rowan is a contributing author for the International Energy Agency Energy Conservation in Buildings and Community Systems Annex 46 “Energy and Process Assessment Protocol”, having authored Appendices F & G detailing proper implementation of Infrared Analysis of Buildings and Air Leakage Testing of Large Buildings.


NEXUS staff have performed thousands of water penetration tests on multi-family residential windows, storefront and curtain-wall systems both new and old. Being enthusiastic problem solvers, NEXUS has custom fabricated a spray rack mount that allows us to test windows that would otherwise be inaccessible by traditional methods.

​We perform testing per AAMA 501.2 and 502, as well as provide spray rack testing per ASTM E-1105 to comply with the requirements of RCW 64.55.050.


NEXUS provides a complete list of performance testing including roof core sampling, adhesion testing, water absorption and moisture metering, acoustic testing, and verifications of thermal performance.


Our experienced field staff provide third party inspections during construction, utilizing a working knowledge of proven thermal, air, and moisture barrier techniques. Our inspectors are knowledgeable and able to make recommendations on site to avoid holding up construction while reports are written. NEXUS is sensitive to construction schedules and understand the importance of reliable and effective inspections to maintain quality on construction sites.