Supporting Reference

BC Energy Step Code, Builder Guide for the ExAC

The Builder Guide to the BC Energy Step Code, published by BC Housing and produced by RDH Building Science Inc., explains how to design and build wood-frame residential buildings to the performance targets of the BC Energy Step Code. Examitect's ExAC study plan lists it as a supplementary reference for the NECB category in Section 2 and for Sustainable Design Literacy in Section 3.

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BC Energy Step Code Builder Guide overview

Builder Guide at a glance

Full titleBuilder Guide to the BC Energy Step Code
PublisherBC Housing (funded by the Province of BC, BC Housing, BC Hydro, City of Vancouver, and City of New Westminster)
Produced byRDH Building Science Inc.
Edition on fileFirst Edition, December 2018, Version 1.0, Lower Steps
LanguagesEnglish
Primary audienceBuilders, designers, and building officials working on wood-frame Part 9 and wood-frame Part 3 residential buildings
ExAC relevanceSupplementary for Section 2 (NECB) and Section 3 (Sustainable Design Literacy) on Examitect's ExAC study plan
Where to accessBC Housing. An interactive web tool covering the same content is at energystepcode.ca; check there for the current version.

Why the Builder Guide matters for the ExAC

The Builder Guide is supplementary on Examitect's ExAC study plan, listed for two specific categories: the NECB category in Section 2 and Sustainable Design Literacy in Section 3. The primary readings for those categories remain the NECB 2020 and CHING, but the Builder Guide gives you a concrete picture of how performance-based energy codes actually shape an enclosure, an air barrier, and a mechanical system.

It also compresses the vocabulary the ExAC reuses without redefining. Thermal Energy Demand Intensity (TEDI), Total Energy Use Intensity (TEUI), Mechanical Energy Use Intensity (MEUI), the performance path, the prescriptive path, and the enclosure-first approach all live in this guide. Learning them here speeds up your NECB reading considerably.

If you work or intern in BC, the Builder Guide also frames federal energy code logic in provincial terms. BC was the first province to roll out a stepped energy code, and the guide is a working example of where the national approach is heading.

How to study the Builder Guide for the ExAC

  • Start with the NECB 2020 as the primary reference for Section 2, then read the Builder Guide for plain-language context on the same performance ideas.
  • Internalize TEDI, TEUI, and MEUI from Section 03. Build a one-line definition and the unit (kWh per square metre per year) for each.
  • Spend most of your time on Section 04 (Principles), Section 06 (Assemblies), and Section 07 (Airtightness). These tie directly to building science questions in Section 3 of the Examination for Architects in Canada (ExAC).
  • Pair the assembly diagrams in Section 09 with CHING. CHING covers the general wood-frame logic; the Builder Guide covers the high-performance variants of the same assemblies.
  • Read the glossary at the back in one pass before exam day. It covers dew point, framing factor, solar heat gain coefficient (SHGC), stack effect, and other vocabulary the ExAC reuses.

ExAC sections the Builder Guide supports

  1. Section 2: Codes

    Supplementary for applying the principles of the National Energy Code of Canada for Buildings (NECB). The NECB 2020 is the primary reference; the Builder Guide provides a residential, wood-frame example of the same performance-based logic.

  2. Section 3: Sustainability

    Supplementary for Sustainable Design Literacy, specifically the category on analyzing the impacts of climate change on design. Section 04 and Section 07 of the Builder Guide feed directly into this content area.

Inside the Builder Guide: the nine sections

The Builder Guide is organized into nine numbered sections plus four appendices. Each section addresses a different layer of building a Step Code home, from setting performance targets to detailing the rim joist.

SectionWhat it coversWhy it matters for the ExAC
01 Introduction Scope of the guide, the buildings it applies to, and how to read it. Sets the boundary: wood-frame Part 9 and wood-frame Part 3 residential, Lower Steps only.
02 How to Use This Guide A flow chart linking climate zone, building type, and target Step to the rest of the guide. Models the decision tree a designer follows on any energy-coded project.
03 Overview of the Step Code Goals, benefits, changes to design and build processes, working with an energy modeller, Step Code metrics, and performance targets tables including the City of Vancouver tables. The metrics chapter. TEDI, TEUI, MEUI, and airtightness targets all come from here.
04 Principles of High-Performance Buildings Building as a system, design strategies (form factor, solar orientation, shading), building enclosure durability, thermal comfort, condensation and hygiene. Lines up directly with Sustainable Design Literacy questions about climate change impacts on design.
05 Energy Performance Requirements BC climate zones, example enclosure performance ranges, and mechanical equipment examples for Part 9 buildings. Shows the climate zone logic shared with the NECB and the National Building Code.
06 Assemblies Above-grade walls, sloped roofs, low-slope roofs, below-grade walls and slabs, windows and doors. The wood-frame assemblies the ExAC tests in Sections 2 and 3 appear here with effective R-values.
07 Airtightness Air barrier as a system, requirements, strategies, detailing, and transitions. Airtightness is a Step Code compliance metric and a NECB requirement; the principles transfer directly.
08 Mechanical Equipment and Systems Heating and cooling, ventilation, domestic hot water, auxiliary equipment. Heat Recovery Ventilators (HRVs), heat pumps, and domestic hot water efficiency feed straight into NECB and sustainable design questions.
09 Details Drawn details for windows, sloped roofs, low-slope roofs, rim joists, balcony rim joists, and below-grade. Companion drawings to CHING for high-performance wood-frame detailing.
Appendices A to D BC Part 9 Step Code Compliance Report, sample flow charts, sample energy modelling results, and mock-up build instructions. Reference material; lighter exam load than Sections 03 through 08.

If you only have a short window, Sections 03, 04, 06, and 07 carry the most ExAC-relevant content. Section 08 is also useful when you reach mechanical systems in your NECB study.

Key Step Code terms every ExAC candidate should know

The Builder Guide introduces vocabulary that the ExAC reuses without redefining. Learn these terms early so you spend exam time choosing the answer, not parsing the question.

TermWhat it means in the Builder Guide
Thermal Energy Demand Intensity (TEDI)Annual heating energy demand for space conditioning and ventilation air, per unit of floor area (kWh per square metre). Does not include domestic hot water.
Total Energy Use Intensity (TEUI)A performance metric for the equipment and systems of Part 3 buildings. Total energy consumption per unit of floor area, including HVAC, base loads, and auxiliary equipment.
Mechanical Energy Use Intensity (MEUI)A performance metric for the equipment and systems of Part 9 buildings. Varies with building size and whether mechanical cooling is included. Excludes base load energy use.
Greenhouse Gas Intensity (GHGI)An additional metric for City of Vancouver rezoning, expressed in kg CO2e per square metre per year. Not part of the BC Energy Step Code itself.
Enclosure-first approachA design strategy that prioritizes a highly insulated and airtight building enclosure to reduce heating and cooling loads before sizing mechanical systems.
Heat Recovery Ventilator (HRV)A mechanical ventilation device that recovers heat from outgoing exhaust air using a passive heat exchanger.
Energy Recovery Ventilator (ERV)A ventilation device that, like an HRV, recovers heat from outgoing exhaust air using a passive heat exchanger, and also controls the transfer of moisture between air streams.
Performance pathA compliance route that uses energy modelling to show the building meets the same energy performance as a reference house designed under the prescriptive subsections of the BC Building Code.
Prescriptive pathA compliance route that meets defined R-values, U-values, and other component requirements set out in the BC Building Code without energy modelling.
Part 9 buildingsResidential buildings three storeys or less in height with a footprint of 600 square metres or less. Includes single-family detached homes and small apartments.
Part 3 buildings (wood-frame)Residential buildings over three storeys or over 600 square metres in footprint. The Builder Guide covers only the wood-frame subset, up to six storeys.
Form factor (VFAR)Vertical surface area to floor area ratio. A lower VFAR generally means less heat loss through the enclosure; complex massing increases VFAR.

Tips for Intern Architects reading the Builder Guide

The Builder Guide was written for builders, not for ExAC candidates. If you're early in your internship under the Internship in Architecture Program (IAP) or its provincial equivalent, here's how to read it without losing time on details you won't be tested on.

Tip 1, read it as a NECB sidebar, not a standalone text. The NECB 2020 is the primary reading for the NECB category. Read the Builder Guide alongside it the same way you'd use a worked example next to a textbook. Anchor every Builder Guide chapter to a corresponding NECB section in your notes.

Tip 2, memorize the three metrics. TEDI, TEUI, and MEUI come up constantly. Build a one-line definition for each, in your own words, and add the unit (kWh per square metre per year). The exam won't ask you to calculate them; it will ask which one applies to which building type or which load.

Tip 3, picture the assemblies. Section 06 is dense with effective R-values, framing factor adjustments, and assembly diagrams. Don't memorize numbers. Memorize what changes from one Step to the next, and what trade-offs each assembly choice creates for cost, constructability, and moisture management.

Tip 4, learn the path choice. The performance path and prescriptive path appear in both the BC Building Code and the NECB. Be able to explain what triggers each choice and what an energy modeller adds to the team when you take the performance path.

Tip 5, treat airtightness as a Section 3 topic. Section 07 reads like a building science text. The air barrier as a system, transitions, and detailing of penetrations are recurring Section 3 themes under Building Science and Assemblies.

Tip 6, don't get pulled into BC-specific minutiae. The exam is national. Step Code targets, BCBC subsection numbers, and City of Vancouver rezoning are useful context but are unlikely to be tested directly. Use them to internalize the underlying logic, not to memorize specifics.

Tip 7, read the glossary first. If you only have an evening, read the glossary at the back. It's the fastest route to the vocabulary the ExAC reuses without redefining.

Common ExAC scenarios where the Builder Guide helps

These question types come up around the NECB and Sustainable Design Literacy. When you see one, the Builder Guide chapters fill in the picture even where the NECB is the primary reference.

  • A Part 9 home is targeting a higher Step. Which compliance metric is the binding constraint, and what trade-offs does the design team face?
  • The mechanical engineer proposes downsizing the heating system. What does the enclosure need to do to justify that decision?
  • A project sits in a colder climate zone. How does the same Step translate into different effective R-values across BC?
  • A continuous air barrier is required. Which trades are responsible for which transitions, and where do failures typically occur?
  • A high-glazing facade is creating overheating risk. What enclosure and mechanical responses are available before adding cooling capacity?
  • The client wants to follow the performance path rather than the prescriptive path. What is the architect's coordination responsibility with the energy modeller?
  • A municipality references the BC Energy Step Code in its rezoning policy. What ExAC-style code-coordination issues does that raise for the architect?

Most of these route back to NECB 2020 provisions, with the Builder Guide providing the residential, wood-frame illustration of how the rules play out in practice.

How the Builder Guide compares to other ExAC references

The Builder Guide is a focused supplementary text. Knowing where it stops helps you decide what to read for which kind of question.

ReferenceWhat it's forHow the Builder Guide relates
Builder Guide Plain-language guidance on meeting BC Energy Step Code performance targets in wood-frame residential construction. The supplementary reference for residential energy performance on Examitect's ExAC study plan.
NECB 2020 The federal model energy code for buildings; the primary reference for ExAC Section 2 NECB questions. The Builder Guide gives a concrete BC residential example of the performance-based logic the NECB uses at the federal level.
NBC 2020 The national model building code covering technical compliance requirements. NBC Part 9 climate zones, ventilation, and energy provisions overlap with what the Builder Guide illustrates for BC.
CHING (Building Construction Illustrated) Building science, assemblies, materials, and detailing. Read CHING for the general wood-frame assembly logic; read the Builder Guide for the high-performance variants of the same assemblies.
BC Energy Step Code Design Guide Companion BC Housing guide aimed more at design teams, with broader Part 3 coverage. Both guides are listed on Examitect's study plan as supplementary; the Builder Guide is the builder-focused, wood-frame-focused half of the pair.
Building Envelope Thermal Bridging Guide Effective R-values and thermal bridging analysis for wall, roof, and floor assemblies. The Builder Guide cites effective R-values; the Thermal Bridging Guide gives the underlying calculation method.
CHOP Canadian Handbook of Practice (CHOP). The practice spine of the ExAC reading list. Different scope entirely. CHOP covers the architect's process; the Builder Guide covers how a high-performance wood-frame home is actually constructed.

How Examitect reinforces the Builder Guide

Reading the Builder Guide is half the work. The other half is recognizing the content under pressure on a timed exam. Examitect's question bank pulls from the NECB and Sustainable Design Literacy categories where the Builder Guide is listed as supplementary, with each answer explanation pointing back to the relevant Builder Guide section or NECB article so you can re-read just the pages you need.

You also get scenario-based questions that put performance-path thinking into a real project context, full-length mock exams that mirror ExAC pacing, and free study notes for every section. Try a few sample questions first, then check pricing when you want the full bank.

FAQ

Builder Guide FAQ

The Builder Guide to the BC Energy Step Code is a free industry resource published by BC Housing and produced by RDH Building Science Inc. It explains how to design and build wood-frame residential buildings to the performance targets set by the BC Energy Step Code, covering Part 9 homes up to three storeys and wood-frame Part 3 low- and mid-rise residential buildings up to six storeys.

Supplementary. Examitect's ExAC study plan lists the Builder Guide as a supplementary reference for two categories: applying the principles of the National Energy Code of Canada for Buildings in Section 2, and analyzing the impacts of climate change on design under Sustainable Design Literacy in Section 3.

Section 2 (Codes), specifically the NECB category, and Section 3 (Sustainability and final project) under Sustainable Design Literacy. The primary reference for Section 2 NECB content is the NECB 2020 itself; the Builder Guide gives plain-language context for the same performance ideas.

The Step Code uses performance metrics instead of prescriptive R-values and U-values. The core metrics are Thermal Energy Demand Intensity (TEDI), which applies to both building parts, Total Energy Use Intensity (TEUI) for Part 3 buildings, and Mechanical Energy Use Intensity (MEUI) for Part 9 buildings. Airtightness targets are also part of compliance. The City of Vancouver adds Greenhouse Gas Intensity (GHGI) for rezoning applications.

Yes, but only wood-frame Part 3 low- and mid-rise residential buildings over three storeys or over 600 square metres in footprint. Non-combustible Part 3 buildings are outside its scope.

The Builder Guide we have on file is the first edition, published in December 2018, Version 1.0, covering the Lower Steps of the Step Code. Updated editions and a companion web tool are published by BC Housing; check the official source for the current version before exam day.

Both guides are published by BC Housing for the BC Energy Step Code. The Builder Guide is written for builders, designers, and building officials and focuses on wood-frame construction and the practical assemblies, airtightness strategies, and mechanical equipment that meet the Steps. The Design Guide is targeted more at design teams working on Part 3 buildings. ExAC candidates studying NECB principles can read either, and Examitect's study plan lists both as supplementary.

No. Examitect's study plan keeps the NECB 2020 itself as the primary reference for the NECB category. The Builder Guide is supplementary reading that makes the performance-based approach easier to picture, especially for residential wood-frame work.

Keep exploring

Other ExAC reference books.

The Builder Guide is one of several energy and sustainability references on Examitect's ExAC study plan. Continue with the rest.

NECB

National Energy Code of Canada for Buildings. The primary reference for ExAC Section 2 NECB questions.

NBC 2020

National Building Code of Canada. The primary reference for every category in ExAC Section 2.

CHING

Building Construction Illustrated. The visual reference for assemblies, materials, and detailing across Sections 1 and 3.

BC Energy Step Code Design Guide

The companion BC Housing guide, written more for design teams and Part 3 buildings.

Building Envelope Thermal Bridging Guide

Effective R-values and thermal bridging analysis for wall, roof, and floor assemblies.

CHOP

Canadian Handbook of Practice. The practice spine of the ExAC, primary across most of Sections 1, 3, and all of 4.

RSMeans

RSMeans Cost Data. North American construction cost data, used for Section 1 Cost Management questions.

Yardsticks

Hanscomb Yardsticks for Costing. Canadian elemental cost data by building type and region, for Section 1 Cost Management.

Supporting references

The extended reading list of supplementary references that show up across the ExAC reading list.