This publication is the Guide to Near Net Zero Residential Buildings is published by NAIMA Canada.

It consolidates information on how builders and designers may achieve the near net zero energy efficiency targets in current and upcoming codes, including the British Columbia Energy Step Code.

It is intended to be an industry resource for designing and constructing low energy use buildings using mineral fibre insulation without compromising other aspects of building performance including moisture management, airtightness, and durability.

This guide is limited to Part 9, wood-frame construction, with a focus on British Columbia, though the principles in this guide may be applied throughout Canada.


  • Near Net Zero Design & Code Compliance
    1. The BC Energy Step Code
    2. Step Code Metrics
    3. BC Climate Zones
    4. Step Code Targets
  • Benefits of Near Net Zero Construction
    1. Occupant Comfort
    2. Future-Proof Construction
  • Performance Path & Energy Modelling
    1. Potential Pathways To Reaching Near Net Zero
    2. Energy Modelling for Thermal Performance and Value-Optimization
    3. Recommended Effective R-values to Reach Near Net Zero – BC and Across Canada
  • Near Net Zero Design: The Enclosure-First Approach
    1. Minimize Heating/ Cooling Demand
    2. Airtightness
    3. Thermal Insulation
    4. Enclosure Durability
  • Near Net Zero to Net Zero
    1. Required Amount of PV for Net Zero
  • Near Net Zero Above-Grade Wall Assemblies
    1. Split-Insulated Stud Wall
    2. Interior-Insulated Deep Stud Wall
    3. Near Net Zero Roof Assemblies
    4. Interior-Insulated Vented Attic Roof
    5. Interior-Insulated Vented Vaulted Roof
    6. Split-Insulated Low-Slope Roof
  • Near Net Zero Below-Grade Assemblies
    1. Exterior-Insulated Foundation Wall
    2. Exterior-Insulated Floor Slab
  • Example Near Net Zero Building Details
    1. Important Detailing Considerations
    2. Detail 1: Interior-Insulated Attic Roof to Split-Insulated Wall
    3. Detail 2: Interior-Insulated Attic Roof to Interior-Insulated Deep Stud Wall
    4. Detail 3: Split-Insulated Wall to Exterior-Insulated Foundation Wall
    5. Detail 4: Interior-Insulated Deep Stud Wall to Exterior/Split-Insulated Foundation Wall
    6. Detail 5: Exterior-Insulated Foundation Wall to Exterior-Insulated Floor Slab
  • Additional Resources