Why We're Requiring Stainless Steel Fasteners in All Level 1 Curriculum

A Standards Update Based on Evidence

Effective with the 2026 curriculum update, EHCI Level 1 Core Certification now includes expanded coverage of stainless steel fastener requirements for all exterior hardwood applications.

This isn't a manufacturer-driven change. It's based on data.

The Problem We're Seeing

Across dispute reports, field assessments, and feedback from certified professionals, fastener-related issues remain the single most common installation failure mode. Specifically:

• Galvanic corrosion from zinc-plated or galvanized fasteners reacting with tropical hardwood tannins
• Staining and streaking on surrounding surfaces from corroding fastener hardware
• Structural compromise when fasteners degrade in high-moisture exterior environments
• Warranty disputes where the wood is blamed for what is clearly a fastener problem

What Changed in the Curriculum

The updated Level 1 modules now cover:

1. Fastener metallurgy basics — Why 304 vs. 316 stainless matters in coastal vs. inland applications
2. Tannin reactivity — How extractives in dense tropical hardwoods accelerate corrosion in non-stainless metals
3. Hidden fastener systems — When they're appropriate and when face-screwing is the better choice
4. Code compliance — How local building codes intersect with fastener material requirements

For Current Certificate Holders

If you're already EHCI-certified at Level 1 or above, this content will be included in your renewal materials. No additional exam is required for current credential holders, but we strongly encourage reviewing the updated modules.

The Bigger Picture

Standards evolve as the industry learns. That's the point of a living certification program. When we see consistent patterns of preventable failure, we update the curriculum to address them. Stainless steel fasteners aren't optional in exterior hardwood—they're fundamental.