Infiltration and duct leakage video session with Joe Medosch, a Building Analysis, Envelope Professional, as well as International Code Council Residential/Commercial Energy Inspector. This video webinar entails:
- Infiltration and Duct Leakage (IDL) Exam Discussion
- IDL Overview
- Business Opportunities
Watch related videos on Infiltration and Duct Leakage or sign up for live webinars.
IDL Exam & Certification Essentials
IDL certification covers both blower-door (building envelope) and duct leakage testing under ASTM E779 and E1554 standards.
The exam includes hands‑on testing scenarios and requires passing at least 85% on the field portion.
Recertification is required every three years.
IDL Certification Overview
IDL-certified professionals can validate both air infiltration and duct integrity—skills that align with rising energy codes like IECC 2021.
This credential is increasingly required by building departments, program verifications, and consumer expectations.
Business Opportunities with IDL
IDL certification unlocks these service possibilities:
Offering in-house blower-door and duct leakage testing instead of outsourcing.
Supporting builders and contractors to meet mandatory code compliance.
Partnering with auditors, HERS Raters, or local inspection bodies for referrals.
Selling bundled services (room air sealing, testing, reporting) under code or energy program demands.
Why It Matters
IDL certification is practical and accessible: No need for full energy audit certification—just the core testing skillset.
These tests are now required in many jurisdictions for permit and compliance, often making IDL-certified staff essential.
Professionals with IDL credentials can respond to fast-growing demand from new energy programs, codes, and performance-based construction.
Summary at a Glance
| Topic | Key Details |
|---|---|
| Certification | Hands-on IDL exam covering blower-door & duct tests |
| Standards Covered | ASTM E779 (envelope) and E1554 (duct systems) |
| Business Benefit | New service offerings and code compliance support |
| Relevance | Meets growing industry needs for mandated testing |
