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Solutions to the most complex and commonly asked Condo Board questions. Join us at 3:30pm (pacific time) on the last Tuesday of every month!
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Tuesday, October 27, 2026

Things That Grow in The Dark of Your Building

Where Mold Hides, Why It's There, and What to Do About It

 This Halloween, the scariest thing in your building probably isn’t making any noise. Mold grows quietly behind walls, under floors and up in attics, and by the time you notice it, it’s usually been there a while. In this month’s episode, your Building Doctor Jens sits down with special guest Joel McCarthy of Apex Companies to look past the usual suspects of leaks and shower steam. They’ll cover where mold is really showing up, and also cover how to inspect without overreacting, what you can safely clean yourself. Bring your questions; Jens and Joel will answer them live. This will be a good one that you don't want to miss.

Join us on October 27 at 3:30PM PDT.

Jens Johanson

Jens Johanson

Founder & Technical Director, J2

 With over 35 years of experience in the construction industry, Jens is a building envelope expert specializing in identifying hidden issues that can lead to costly building failures and legal exposure. He works closely with HOA boards, community managers, and building owners to diagnose problems related to water intrusion and roofing systems, helping them understand how maintenance decisions directly impact risk and liability.In addition to his consulting work, Jens serves as an expert witness in construction defect cases and insurance claims, where he provides clarity on responsibility and standard of care. Known for his thorough assessments and practical approach, Jens helps communities make informed, defensible decisions that protect both their buildings and their long-term financial and legal interests. 

Joel McCarthy

Joel McCarthy

Sr Project Manager, Apex Companies

 Joel is an environmental health professional with 22 years of experience in industrial hygiene and environmental consulting. His work encompasses a broad range of building environments, including schools, healthcare and medical facilities, residential properties, and industrial settings. He brings a practical, building-focused perspective to evaluating environmental concerns and helping clients navigate complex indoor environmental challenges. challenges. His areas of focus include indoor environmental quality, microbial growth assessment, and remediation. He understands the importance of identifying the conditions that contribute to mold growth, developing appropriate strategies to address affected areas, and implementing preventive measures to reduce the likelihood of recurring problems. 

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