This Help Center article is a summary of the official Earthaus PHL Binder Breathability Test Results document.
Testing Overview
Conducted by: Braun Intertec Corporation | Concrete Science, Chicago, IL
Date: November 18, 2024
Standard: ASTM D6490 — Water Vapor Transmission Rate
Purpose: Measures water vapor permeance, showing how well a plaster allows moisture to pass through.
Results
Water Vapor Permeance (Perms):
Material | Permeance (Perms) |
Earthaus PHL | 18.2 – 19.8 |
European NHL (various grades) | 8.5 – 12.5 |
Cement Stucco | 2 – 3 |
Earthaus PHL Key Findings:
Water Vapor Transmission Rate: 5.2 – 5.5 g/h·m²
Water Vapor Permeance: 18.2 – 19.8 perms
What This Means
Earthaus PHL moves more moisture through walls than NHL or cement stucco.
It prevents the moisture entrapment that leads to mold, rot, and material degradation.
It provides nearly double the vapor transmission of NHL in some cases.
Cement stucco, with only 2–3 perms, traps moisture, leading to cracking and deterioration.
Natural walls (straw, hemp, adobe) require breathable plasters; Earthaus PHL supports continuous drying.
Conclusion
Earthaus PHL Binder exceeds the breathability of both cement stucco and NHL.
It ensures durability, moisture control, and compatibility with natural building systems.
Customer Support
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