AAMA 502 vs. 503: What's the Difference?

Seeing "AAMA 502" or "AAMA 503" in your commercial project specs, but not sure which one applies?

While laboratory ratings tell you what a pristine window can do in a vacuum, field spray testing reveals how it actually performs once installed in your real-world wall assembly.

In this guide, we break down the critical differences between these testing standards, why testing early is your best defense against systemic installation errors, and how to guarantee a truly watertight building envelope.