*The Effective R Calculator tool is fully optimized for best performance in Google Chrome.
The purpose of this R Value online tool is to provide designers with climate zone-appropriate insulated wall assembly solutions that are easily comparable with national and provincial energy efficiency prescriptive provisions.
Each assembly lists:
- Effective thermal resistance Reff* for complying with the National Building Code (NBC) for houses and the National Energy Code for Buildings (NECB) for larger buildings
- Installed R-value for complying with the Ontario Building Code
- Centre of cavity R-value for complying with the Quebec Construction Code.
*The calculation of effective thermal resistance is performed in compliance with NBC Subsection 9.36.5. of Division B.
Each assembly comes with a climate-specific colour-coded durability assessment, which has been determined considering computer analysis and field experience by building science experts in Canada.
 | List of Available Wall Assemblies |  | How to Use the Effective R Calculator |
 | Canadian Code Requirements for Above Grade Wall Thermal Design |  | Understanding the Builder Notes |
 | Wall Thermal Design Performance Literature: Excerpts from the CHBA Manual |  | Understanding the Building Science Durability Notes |
ACKNOWLEDGEMENTS
Many thanks to the steering committee and project team for making this online tool possible:
Steering Committee
| Alejandra Nieto | ROCKWOOL |
| Ben Hawken | Mattamy Homes Limited |
| BJ Yeh | APA – The Engineered Wood Association |
| Bob Wilson | R.S. Wilson Building Inspection & Consulting Inc. |
| Bruce West | City of Brampton |
| Christopher McLellan | Natural Resources Canada |
| Cory McCambridge | APA – The Engineered Wood Association |
| Dave Henderson | Brookfield Homes |
| David Silburn | SAIT Green Building Technologies |
| Gillian Haley | ERA Architects Inc. |
| Jason Shapardanis | Empire Communities |
| Jieying Wang | FPInnovations |
| John Hockman | JLHockman Consulting Inc. |
| Kelsey Saunders | Sustainable.TO |
| Louis Previte | Great Gulf Homes |
| Paul Smith | Mattamy Homes Corporation |
| Peter Birkbeck | Icynene Inc. |
| Peter Culyer | EIFS Council of Canada |
| Richard Kadulski | Solplan Review |
| Rick Gratton | Brookfield Residencial Properties Inc. |
| Rick Roos | ROCKWOOL |
| Robert Marshall | CertainTeed SAINT-GOBAIN |
| Salvatore Ciarlo | Owens Corning Canada |
| Silvio Plescia | Canada Mortgage and Housing Corporation |
| Steve Doty | Empire Communities |
| Todd Rogers | City of St. Catharines |
To join the committee or to discuss inclusion of more products in the tool, please contact Robert Jonkman – [email protected]
Project Team
| Project Initiator | Robert Jonkman | Canadian Wood Council |
| Project Lead | Michael Lio | buildABILITY Corportation |
| Project Manager and Publishing Expert | Francesca Cuda | buildABILITY Corporation |
| Builder Lead and Field Expert | Andy Oding | Building Knowledge Canada |
| Technical Lead and Building Science Expert | Chris Timusk | Timusk Consulting, George Brown College |
| Technical Project Advisor | Gord Cooke | Building Knowledge Canada |
| WUFI Expert Panelist | Graham Finch | RDH Consulting |
| WUFI Expert Panelist | Chris Schumacher | RDH Consulting |
