Water intrusion is one of the most frustrating issues a homeowner can face—especially in a barndominium where wall systems can function very differently between living areas and shop spaces.

In this video, we walk through a real-world scenario from a project in Alvarado, Texas, where rain entered through an unsealed J-trim on the shop side of the structure.

We break down the key differences between how the living side is built using the Zip System for proper weather-resistant barrier (WRB) protection, drainage, and thermal control, versus the shop side where the siding itself serves as part of the insulation and moisture barrier.

When water gets behind the metal on the shop side, it travels inward rather than outward—making proper sealing and secondary protection layers absolutely critical.

We also demonstrate how the issue was identified using thermal imaging, the corrections being made, and why attention to these details is essential for long-term durability and comfort.

This is a great example of real on-site problem solving and a valuable lesson for anyone building or designing a barndominium.

Understand how your wall systems perform differently so you can prevent moisture issues before they start.