What is the purpose of destructive verification in moisture testing?

• A. To identify moisture across the entire building
• B. To confirm moisture presence at specific locations
• C. To estimate moisture exposure duration
• D. To eliminate moisture entirely

Answer: (B)

Destructive verification in moisture testing is about obtaining a definitive read of moisture at a specific spot by removing a small sample and directly measuring the moisture content. This is necessary because non-destructive methods can show surface moisture or raise suspicion, but they can’t prove moisture exists inside a substrate or reveal exact depth. By targeting particular locations—such as under flashing, at deck-to-membrane interfaces, or where moisture is suspected—you can confirm that moisture has penetrated those layers, and determine the severity and exact location needed for repair. It helps separate true moisture in a critical area from false positives caused by surface conditions or coatings. It’s not intended to map moisture across an entire building, nor to estimate how long the moisture has been present or to eliminate moisture by itself. The goal is precise confirmation at chosen spots to guide remediation decisions.