Guide to the Prescriptive Energy Efficiency Design Summary Form
This form must accurately reflect the information contained on the drawings and specifications being submitted.
Refer to Supplementary Standard SB-12 for details about building code compliance requirements. Further
information about energy efficiency requirements for new buildings is available from the provincial building code
website or the municipal building department.
The building code permits a house designer to use one of four energy efficiency compliance options:
1. Comply with the SB-12 Prescriptive design tables (this form is for this option (Option 1)),
2. Use the SB-12 Performance compliance method, and model the design against the prescriptive standards,
3. Design to Energy Star, or
4. Design to R2000 standards.
COMPLETING THE FORM
B. Compliance Options
Indicate the compliance option being used.
SB-12 Prescriptive requires that the building conforms to a package of thermal insulation, window and
mechanical system efficiency requirements set out in Subsection 3.1.1. of SB-12. Energy efficiency design
modeling and testing of the building is not required under this option. Certain substitutions are permitted. In
which case, the applicable airtightness targets in Table 18.104.22.168.A must be met.
C. Project Design Conditions
Climatic Zone: The number of degree days for Ontario cities is contained in Supplementary Standard SB-1
Windows, Skylights and Glass Doors: If the ratio of the total gross area of windows, sidelights, skylights, glazing
in doors and sliding glass doors to the total gross area of walls is more than 17%, higher efficiency glazing is
required. If the ratio is more than 22%, the SB-12 Prescriptive option may not be used. The total area is the sum of all
the structural rough openings. Some exceptions apply. Refer to 22.214.171.124. of SB-12 for further details.
Fuel Source and Heating Equipment Efficiency: The fuel source and efficiency of the proposed heating
equipment must be specified in order to determine which SB-12 Prescriptive compliance package table applies.
Other Building Conditions: These construction conditions affect SB-12 Prescriptive compliance requirements.
D. Building Specifications
Thermal Insulation: Indicate the RSI or R-value being proposed where they apply to the house design. Under
the SB-12 Prescriptive option, alternative ICF wall insulation is permitted in certain conditions where other
design elements meet higher standards. Refer to SB-12 for further details. Where effective insulation values
are being used, the Authority Having Jurisdiction may require supporting documentation.
BUILDING CODE REQUIREMENTS FOR AIRTIGHTNESS IN NEW HOUSES
All houses must comply with increased air barrier requirements in the building code. Notice of air barrier
completion must be provided and an inspection conducted prior to it being covered.
The air leakage rates in Table 126.96.36.199.A are not requirements. This provision is a voluntary provision for when
credits for airtightness are claimed. Credit for air tightness allows the designer to substitute the requirements of
compliance packages as set out in Table 188.8.131.52.B or 184.108.40.206.C. Neither the air leakage test nor compliance with
airtightness targets given in Table 220.127.116.11.A are required, unless credit for airtightness is claimed. Table
18.104.22.168.A provides airtightness targets in three different metrics; ACH, NLA, NLR. Any one of them can be used.
OBC Reference Default Air Leakage Rates (Table 22.214.171.124.A)
The building code requires that a blower door test be conducted to verify the air tightness of the house during
construction if the SB-12 Prescriptive option with airtightness credit being applied. Results of the airtightness
test may need to be submitted to the Authority Having Jurisdiction. Airtightness of less than 2.5 ACH @ 50 Pa
(or NLA or NLR equivalent) in the case of detached houses, or 3.0 ACH @ 50 Pa (or NLA or NLR equivalent) in
the case of attached houses is necessary to meet the required energy efficiency standard.
E. House Designer
The building code requires designers providing information about whether a building complies with the building
code to have a BCIN. Exemptions apply to architects, engineers and owners designing their own house.
Form authorized by OHBA, OBOA, LMCBO. Revised November 30, 2016.