This resource was developed through the technical expertise and deep building science backgrounds of Dr. John Straube from RDH Building Science and Gord Cooke of Building Knowledge Canada. It is a summary of information presented at Building Knowledge Canada’s 2025 Spring Training Camp by Dr. Straube.

The HCRA’s intent is to increase access to educational resources for its licensees – and this document raises awareness of common callback issues experienced by new home builders, their causes, and how to prevent them.

As many organizations across the industry strive to identify and address common callback issues, the consistent theme for recurring ‘Top 10’ issues all seem to be linked to moisture issues. Moisture is still a great challenge in the homebuilding industry, leading to issues with leaks, mold, rot, and cracks. This resource highlights common moisture-related issues, from ice dams to basement moisture, and the proven building science practices for you to consider adopting into your front-line construction methods.