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OBC 2006 Changes to Energy Efficiency of Low Rise,
Part 9 Residential Buildings
Effective January 1, 2007
Part 12 Resource Conservation replaces the energy efficiency requirements in Part 9 (9.25 and 9.38) and in Part 2 for Part 3 Large Buildings.
Under Part 12, energy efficiency of low rise residential buildings can be reached by three approaches.
1. Prescriptive Approach Sub Section 12.3.2.
Table 12.3.2.1. below lists the minimum insulation requirements. Example ñ walls constructed with 2x6 can use R20 PINK Fiberglas
batts in the cavity (R19 at 5.5" thickness) and 2x4 walls need 1" CodeBord XPS sheathing (R5) and PINK Fiberglas R14
batts in the cavity.
2. Design Approach Sub Section 12.3.3.
Thermal design requirements must conform to Table 12.3.3.3.
3. Performance Approach Sub Section 12.2.1.
Must provide a rating of 80 or more when evaluated in accordance with NRCan "EnerGuide for New Houses: Administrative and Technical Procedures".
[Note, reflective surfaces of insulation materials shall not be considered in calculating the thermal resistance of building assemblies as per Sentence 12.3.2.1.(3).]
Table 12.3.2.1
Minimum Thermal Resistance of Insulation to be installed Based on Degree-Day Zones
Effective January 1, 2007*
Minimum R (RSI) Value Required
Building Element Exposed to Exterior or to Unheated Space.
Zone 1
5000
Zone 2
>5000
Electric Space Heating
Zone 1 & 2
Ceiling below attic or roof space 40 (7.00) 40 (7.00) 50 (8.80)
Roof assembly without attic or roof space 28 (4.93) 28 (4.93) 28 (4.93)
Wall other than foundation wall 19 (3.34) 24 (4.22) 29 (5.10)
Foundation walls enclosing heating space Min. 600mm (24") below grade 12 (2.11) 12 (2.11) 19 (3.34)
Floor, other than slab-on-ground 25 (4.40) 25 (4.40) 25 (4.40)
Slab-on-ground containing heating pipes, tubes, ducts, or cables. 10 (1.76) 10 (1.76) 10 (1.76)
Slab-on-ground not containing heating pipes, tubes, ducts or cables 8 (1.41) 8 (1.41) 10 (1.76)
Basement floor slabs located more than 600mm below grade 0.00 0.00 0.00
*Designers can also meet at least EnerGuide 80 to achieve Performance Approach compliance.
OBC 2006, Article 12.3.2.2. Elements Acting as Thermal Bridge Requires 20% increased cavity insulation for steel stud construction
or continuous (sheathing) insulation at least equal to 25% of the required thermal resistance for the insulation portion of the assembly.
OBC 2006, Article 12.3.2.4. Insulation of Foundation Walls Foundation walls enclosing heated space shall be insulated from the underside
of the subfloor to not less than 600mm (2 ft.) below adjacent exterior ground level. After Dec. 31, 2008 foundation walls shall be insulated (near full
height) from the underside of the subfloor to not more than 380mm (15 in.) above the finished floor level of the basement.
OBC 2006, Article 12.2.1.2. Energy Efficiency Design After Dec. 31, 2011 The energy efficiency of a Part 9 residential building shall meet the
performance level rating of 80 or more when evaluated in accordance with NRCan "EnerGuide for New Houses: Administrative and Technical Procedures".
ENERGY STAR for New Homes will help you refine the way of building to EnerGuide 80 before it becomes mandatory. Owens
Corning Canada will work with you to customize a program to help build homes that incorporate Insulation Systems, to
specifically address energy-efficiency, air leakage, moisture control, noise control and indoor air quality. To find out how, contact
Andy Goyda at 1-800-850-2290, Owens Corning Canada Builder Lead.
Printed in Canada September 2006. Actual savings vary depending on initial insulation levels, climate, house tightness and occupant activities. ENERGY STAR for New Homes is a label given to homes that meet balanced, whole-house,
energy-efficiency standards, guaranteeing their owners significant savings. New homes that receive ENERGY STAR label are 30-35 percent more efficient than those built to minimum Ontario building code standards.
The ENERGY STAR mark is a registered trademark of the United States EPA (Environmental Protenction Agency) administered and promoted in Canada by Natural Resources Canada. THE PINK PANTHERTM & 1964 - 2006
Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The colour PINK is a registered trademark of Owens Corning Canada, Inc. 2006 Owens Corning Canada, Inc. All rights reserved.
Pub. No. 200119
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