📈 Why More Manufacturers Are Approving ASTM 2659 Impedance Meters for Moisture Testing

One trend that keeps accelerating: manufacturers are explicitly calling out ASTM F2659 electrical impedance meters as approved tools for moisture evaluation.

This is a big shift from a few years ago, when these meters were often treated as “screening tools only.”

What’s driving it?

✅ Non‑destructive testing

Manufacturers want moisture data without drilling, patching, or damaging assemblies—especially in finished or occupied spaces.

✅ Speed + coverage

Impedance meters allow technicians to scan large areas quickly and identify moisture patterns, not just point‑in‑time readings.

✅ Repeatability

ASTM 2659 provides a standardized method, which gives manufacturers confidence in consistency across jobs, techs, and regions.

✅ Better decision‑making

Instead of guessing where moisture might be, manufacturers can now require documented scans before remediation, flooring installs, or warranty decisions.

What this means for contractors & inspectors:

• If you’re not using an ASTM 2659‑compliant meter, you may already be behind manufacturer expectations

• Documentation from impedance scans is becoming more defensible

• “Approved tool lists” are expanding—and meters that meet ASTM 2659 are showing up more often

Important note:

Impedance meters still don’t replace in‑situ probes or RH testing where required—but manufacturers are increasingly recognizing them as a legitimate, primary assessment tool for many applications.

To name a few:

1. Cali Floors

2. Trafficmaster

3. Artisan Hardwoods

4.Tarkett(qualitative purposes)

5.Sika

💬 Curious:

Which manufacturers have you seen specifically call out ASTM 2659 meters in their documentation?

And how has that changed the way you test or report moisture?

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