Pillar One

Indoor Air Quality &
Mold-Free Construction

The building science foundation for a home that protects your health — moisture, air, vapor, and thermal performance working in concert.

Enroll in the Course

Why It Matters

The Numbers Behind Healthy Air

Indoor air quality is not optional — it's the foundation of occupant health.

87%

of time Americans spend indoors — where air quality directly determines health outcomes

60%

Relative humidity threshold for mold growth — exceeded in poorly designed envelopes daily

3/8"

Minimum rainscreen gap — water cannot suspend in gaps this size or larger

1.0

ACH50 target — the blower door standard for a high-performance, mold-resistant home

Free Download

Top 20 Building Rules
for Healthy Homes

The complete field guide — all 20 rules with technical specifications, climate notes, and building science references. Yours free.

WAVT framework rules with material specs
Climate-specific vapor retarder guidance
Blower door and IAQ testing thresholds
Referenced to Lstiburek, Risinger, BS-301

Your information is never shared or sold. Unsubscribe anytime.

Check your inbox.

The Top 20 Building Rules guide is on its way.

Non-negotiable building rules

WAVT framework categories

PDF

Branded, printable field guide

The Course

Mold-Free Builder Certificate

8 modules, 20 hours, self-paced. Built for builders, contractors, architects, and homeowners.

Module 01

Introduction to Mold-Free Construction

Why mold-free matters, IAQ fundamentals, and the challenges of modern tight-envelope construction. 2 hrs.

Module 02

Moisture Management Fundamentals

Psychrometrics, moisture movement mechanisms, foundation and site drainage design. 3 hrs.

Module 03

Mold-Resistant Materials

Paperless drywall, closed-cell foam, mineral wool, low-VOC finishes, and material certification. 2.5 hrs.

Module 04

Tightly-Insulated Envelopes

Wall assemblies, air sealing techniques, vapor retarder placement by climate zone. 3 hrs.

Module 05

Ventilation for Indoor Air Quality

ERV vs HRV, ASHRAE 62.2 standards, HVAC integration and humidity control. 3 hrs.

Module 06

Construction Quality Control

Pre-construction planning, moisture testing, blower door testing, post-construction IAQ. 2.5 hrs.

Module 07

Climate-Specific Strategies

Hot-humid (FL/Gulf), cold (MN), and mixed climates — tailored wall assembly strategies. 2 hrs.

Module 08

Case Studies & Certification

Real-world applications, final project, and Mold-Free Builder Certificate exam. 2 hrs.

Enroll Now — Free Preview Available

Indoor Air Quality &Mold-Free Construction

The Numbers Behind Healthy Air

Wall Assembly — Exterior to Interior

Top 20 Building Rulesfor Healthy Homes

Check your inbox.

Mold-Free Builder Certificate

Indoor Air Quality &
Mold-Free Construction

Top 20 Building Rules
for Healthy Homes