National Master Specification (NMS)

Placeholder page for the supporting reference National Master Specification (NMS), part of the Examitect reading list for the ExAC.

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NMS at a glance

Here is the quick summary you need before you open a spec section for the first time.

Full titleNational Master Specification
PublisherNational Research Council of Canada (NRC)
Distributor (Canada)National Building Specifications (NBS), in partnership with the RAIC for member discounts
In useOver 35 years in the Canadian construction industry
LanguagesEnglish and French
Classification systemMasterFormat (40+ Divisions, 6 or 8 digit section numbers)
Primary audienceArchitects, specification writers, engineers, and other design and construction professionals in Canada
Delivery formatsNBS Chorus cloud software; curated Word document libraries
ExAC relevanceSupplementary reference on Examitect's ExAC study plan, most relevant for Section 3 (specifications) and Section 4 (construction office functions)

Why it matters for the ExAC

ExAC sections this reference supports

Section 2
Section 3
Section 4

What the National Master Specification is

The NMS is a pre-written library of construction specification sections covering every procedure, product, and method an architect is likely to encounter on a Canadian project. It does not describe a single building. It describes every building type by providing a full set of master sections that you edit down to match your specific project.

The NRC publishes the NMS and runs a continuous review process, consulting the design and construction industry on technical improvements. The NRC is also responsible for keeping the content bilingual and, according to the RAIC's NMS page, is in the process of updating all sections to include environmentally responsible materials and work practices.

In practice, a specifier opens the NMS section that corresponds to a work type, reads the pre-written requirements and options, deletes what does not apply, fills in project-specific values, and coordinates the result with the drawings. The NMS is the starting point, not the finished product.

Why specifications matter for the ExAC

The ExAC treats specifications as part of the construction documents, not as an afterthought. Section 3 (Sustainability and final project) tests your understanding of what goes into a complete set of contract documents: drawings, specifications, and the relationship between them. Section 4 (Construction and practice) adds questions about how spec language holds up during construction, how substitutions are evaluated, and how the architect defends spec decisions during the construction phase.

Knowing the NMS does not mean memorizing specification text. It means understanding how specifications are structured, what each division covers, and how a spec section translates design intent into contractual language for the contractor. That understanding is what the ExAC tests.

The NMS also introduces vocabulary that appears on the exam: MasterFormat division numbers, the three-part section format, submittals, substitutions, and the distinction between prescriptive and performance specifications. Reading even a handful of NMS sections gives you that vocabulary in context.

How MasterFormat organizes the NMS

MasterFormat is the numbering system behind the NMS. Every spec section gets a unique number: six digits for most sections, eight digits for sections that need additional detail. The Construction Specifications Institute (CSI) and Construction Specifications Canada (CSC) maintain MasterFormat jointly and update it on an ongoing basis.

In 2004, MasterFormat expanded from 16 Divisions to more than 40 Divisions. That expansion matters for ExAC candidates because older projects, older study resources, and older firm templates may still use the 16-division structure. You need to know both systems at a high level.

The Division groupings you should know cold:

Division rangeWhat it covers
Division 00Procurement and Contracting Requirements (bidding forms, instructions to bidders, agreements)
Division 01General Requirements (submittals, substitutions, payment, temporary facilities, project closeout)
Divisions 02 to 14Traditional architectural trades: site conditions, concrete, masonry, metals, wood, thermal and moisture protection, openings, finishes, specialties, equipment, furnishings, special construction, conveying equipment
Divisions 21 to 28Facility services: fire suppression, plumbing, HVAC, integrated automation, electrical, communications, electronic safety and security
Divisions 31 to 35Site and infrastructure: earthwork, exterior improvements, utilities, transportation, waterways and marine
Divisions 40 and beyondProcess equipment, pollution control, and other specialized categories less common in general architectural practice

For most ExAC questions on specifications, Divisions 00, 01, and 02 through 14 carry the load. Division 07 (Thermal and Moisture Protection) and Division 09 (Finishes) show up often in Section 3 questions on building assemblies and construction documents.

The Architectural content library

The NMS is sold in discipline-specific libraries, not just as one undivided block. The Architectural library is the one most ExAC candidates interact with. It covers the full architectural scope of a building project and includes UniFormat content for elemental estimating.

The Architectural library contains:

  • Division 00, Procurement and Contracting Requirements
  • Division 01, General Requirements
  • Division 02, Existing Conditions
  • Division 03, Concrete
  • Division 04, Masonry
  • Division 05, Metals
  • Division 06, Wood, Plastics and Composites
  • Division 07, Thermal and Moisture Protection
  • Division 08, Openings
  • Division 09, Finishes
  • Division 10, Specialties
  • Division 11, Equipment
  • Division 12, Furnishings
  • Division 13, Special Construction
  • Division 14, Conveying Equipment
  • Division 31, Earthwork
  • Division 32, Exterior Improvements
  • Division 33, Utilities

The other discipline libraries (Building Services, Structural, Mechanical, Electrical, Engineering, Conservation, Landscape Architectural, Interior Design, Heavy Civil, Air Transportation, and a Performance library using UniFormat numbering) cover work that typically falls to engineering consultants or specialized firms. Knowing that these libraries exist helps you understand the scope of what a full set of project specifications covers and why specification coordination is part of the architect's role.

The three-part section format

Every NMS section uses the same internal structure. Learning it once lets you navigate any spec section quickly, whether you are writing one during your internship or answering a question about one on the ExAC.

PartWhat it coversTypical content
Part 1
General		 Administrative and procedural requirements that apply to the section's scope of work. Summary of work, references, definitions, submittals required, quality assurance requirements, mock-up requirements, delivery and storage.
Part 2
Products		 What materials and manufactured products are required and how they must be fabricated or manufactured. Acceptable manufacturers, material standards, performance criteria, fabrication tolerances, shop-applied finishes.
Part 3
Execution		 How the work is to be installed in the field, verified, and finished. Examination of substrate, preparation, installation method, field quality control, adjusting and cleaning, protection.

The ExAC occasionally tests this structure directly: for example, which part of a spec section would address submittal requirements, or where you would find the installation tolerance for a given assembly. More often, the structure shows up indirectly, in questions about what the architect reviews and when during the construction phase.

NMS vs. other ExAC references

The NMS is a specialist tool focused entirely on specifications. It does not overlap much with the primary ExAC references, but it does connect to several of them.

ReferenceWhat it's forHow it relates to the NMS
NMSThe master library of pre-written specification sections, organized by MasterFormat.The reference standard for spec structure and language on the ExAC.
CHOPThe RAIC's handbook on architectural practice: project delivery, business management, and every project phase including specification writing.CHOP explains the specifier's role, scope, and obligations. The NMS is the actual spec tool. Read CHOP first to understand why specifications exist, then look at NMS sections to see how they work.
CHINGVisual guide to building construction: assemblies, materials, and structural systems.CHING shows how an assembly is built. The NMS describes how to specify it. A wall assembly in CHING might correspond to NMS sections in Division 04, 06, 07, and 09.
NBC 2020The national model building code: minimum performance requirements for materials and assemblies.The NBC sets the compliance floor. The NMS spec section must meet or exceed NBC requirements. Division 07 (Thermal and Moisture Protection) sections, for example, need to align with NBC envelope performance rules.
CCDC 2Standard stipulated price contract between owner and contractor, including general conditions of the contract.Division 00 of the NMS sets up the procurement and contracting framework. CCDC 2 is the actual contract document. The two work together to form the complete contract.

How to use the NMS for ExAC prep

  • Start with the Division list. Before reading a single section, memorize which Division covers which trade. Do it once, do it early. The Division structure is foundational knowledge that pays off across multiple ExAC questions.
  • Read a Division 01 section end to end. Division 01 is the administrative backbone of every project spec. Reading one complete Division 01 section shows you the range of procedural topics that appear in Section 3 and Section 4 questions: submittals, substitutions, payment applications, and project closeout.
  • Read a Division 07 section alongside a CHING assembly. Pick a wall assembly from CHING and then open the corresponding NMS sections for air barrier, insulation, and cladding. Trace how the design intent in the drawing becomes contractual language in the spec. That connection is exactly what the ExAC tests.
  • Focus on submittals and substitutions. These two topics recur across ExAC questions on construction office functions and construction field functions. Know which part of a spec addresses them (Part 1 General, almost always) and how the architect's review obligations differ from approval.
  • Pair NMS with CHOP. CHOP covers the construction documents phase in Part 6 and discusses the spec writing process, consultant coordination, and the architect's responsibilities around specifications. Read both in the same study session so the context from CHOP supports what you see in the NMS.
  • Do not memorize spec text verbatim. The ExAC does not ask you to reproduce specification language. It asks you to apply the principles behind it: what belongs in which part, who reviews what, and how the spec and drawings interact.

ExAC sections the NMS supports

Examitect's ExAC study plan lists the NMS as a supplementary reference. Here is where it is most likely to be useful by section.

ExAC sectionHow the NMS shows up on Examitect's study plan
Section 1
Design and analysis		 Not a primary resource. Section 1 focuses on design, programming, engineering coordination, and cost management, areas where CHOP, CHING, RSMeans, and Yardsticks carry the load. The NMS is background rather than primary reading here.
Section 2
Codes		 Not applicable. Section 2 is covered by the NBC 2020 and NECB. The NMS does not carry code content.
Section 3
Sustainability and final project		 Supplementary reference for the construction documents and specifications categories. The NMS supports questions about how specifications are structured, what they must contain, and how they coordinate with drawings and codes.
Section 4
Construction and practice		 Supplementary reference for construction office functions. Questions about submittal review, substitution evaluation, and spec administration during the construction phase connect directly to Division 01 content and to the three-part section format.

Tips for Intern Architects reading the NMS

Most Intern Architects encounter specifications on the job before they study them for the ExAC. If you are in the middle of your Internship in Architecture Program (IAP), here is how to connect what you see at work to what you need to know for the exam.

Tip 1, read the spec on your current project. Pull up the project specification for the job you are working on right now. Find the Division 01 section and skim it. That's not an abstraction; it is the actual document governing how your project runs. Reading it in context makes Division 01 concepts stick faster than any textbook exercise.

Tip 2, understand the reviewer's role, not just the writer's. On the ExAC, the questions about specifications are not about how to write one. They are about how the architect reviews submittals, evaluates substitution requests, and coordinates spec sections with drawing details. Focus your study on those review obligations.

Tip 3, learn to read a Division number fast. When a question mentions Division 07 or Division 09, you should know instantly what work is in scope without having to think about it. Build a quick mental map of the Division structure: 01 is admin, 03 is concrete, 07 is envelope, 09 is finishes, 26 is electrical. That reflex saves time on a timed exam.

Tip 4, notice when specs and drawings disagree. On real projects, discrepancies between drawings and specifications are handled through RFIs and change notices. The ExAC tests who has authority to resolve a conflict between the two documents and what the priority order is under a standard Canadian contract. CHOP and CCDC 2 both address this; the NMS puts the question in context.

Tip 5, ask your firm's specifier (or senior architect) to walk you through one section. If your office uses the NMS, ask someone to show you how they edit a master section for a specific project: what they keep, what they delete, and how they confirm the spec aligns with the drawings. That 20-minute conversation is worth a week of independent reading.

Common ExAC scenarios where NMS knowledge applies

These question types appear across ExAC sittings and connect directly to how specifications work in practice. If you see one, your first instinct should be to ask "what does the spec say, and who has responsibility for it?"

  • A contractor requests a substitution for a specified roofing membrane after the project is awarded. What is the architect's obligation, and where in the spec documents is the substitution process defined?
  • A shop drawing submission does not match the spec for a curtain wall system. What does the architect's review stamp mean, and what is the architect's liability if the submission is returned without comment?
  • The drawings show a detail that conflicts with the specification section for an exterior cladding system. Which document governs under a standard stipulated price contract in Canada?
  • An Intern Architect is asked to write a spec section for a new project. Which Division covers the work, and what belongs in Part 1 versus Part 3 of the section?
  • A client asks whether a cheaper alternative product meets the spec requirement. The spec names a performance standard but does not specify a manufacturer. What is the architect's next step?
  • During construction, a material substitution approved in Division 01 turns out to have a different installation requirement than the originally specified product. Who is responsible for updating the affected Part 3 installation requirements?

Each of these scenarios connects to Division 01 administrative procedures, the three-part section format, or the coordination between specifications and drawings. That is the core body of knowledge the NMS helps you build.

How Examitect reinforces NMS knowledge

Reading about specifications is one thing. Applying that knowledge to a timed scenario question is another. Examitect's question bank covers specifications and construction documents as part of Section 3, and submittal and substitution scenarios as part of Section 4. Where a question draws on NMS content, the answer explanation points to the relevant principle (Division 01 administrative language, the three-part format, or MasterFormat structure) so you can trace the reasoning rather than just memorizing the answer.

You also get full-length mock exams that pace you the way the real ExAC does, and free study notes for each section. Try a few sample questions first, then check pricing when you want the full question bank.

NMS and ExAC FAQ

The NMS is a master text base of construction specifications, published by the National Research Council of Canada and organized using MasterFormat. It contains pre-written descriptions of procedures, products, and methods for every common construction situation. Architects and specifiers use it as a starting point for project specifications, editing the pre-written sections to match each project's requirements.

The NMS is published by the National Research Council of Canada (NRC). The RAIC partners with National Building Specifications (NBS) to distribute NMS products to Canadian specifiers, including NBS Chorus cloud software and curated Word document libraries.

MasterFormat is the classification system used to organize construction information into a standard order by division and section number. It is maintained jointly by the Construction Specifications Institute (CSI) and Construction Specifications Canada (CSC). In 2004, MasterFormat expanded from 16 Divisions to more than 40 Divisions, with each section assigned a 6 or 8 digit number. The NMS is organized entirely by MasterFormat numbering.

The NMS appears on Examitect's ExAC study plan as a supplementary reference. It is most relevant for Section 3 categories dealing with construction documents and specifications, and for Section 4 categories dealing with construction office functions and submittal administration.

The NMS is available through NBS Chorus, a cloud-based specification software compatible with Mac, Windows, tablets, and phones. It is also available as curated Word document libraries organized by discipline. SPECedit, a legacy Word-based editor, was discontinued for new support after December 31, 2023. The NMS Complete Set includes both English and French content plus UniFormat sections.

The NMS is the master text base: a large library of pre-written specification sections covering every likely procedure, product, or method. A project specification is the edited subset you pull from the NMS and adapt for a specific project. The NMS gives you the starting text; the specifier's job is to cut, edit, and coordinate it to match the design and code requirements.

Yes. The National Research Council ensures the NMS is available in both English and French. The complete bilingual set is included in the NBS Chorus Complete Set and in the corresponding Word document libraries.

MasterFormat organizes construction information by material and trade (concrete in Division 03, masonry in Division 04, and so on). UniFormat organizes construction information by building element (substructure, shell, interiors). The NMS Performance library uses UniFormat numbering and is used primarily for design-build and early-stage estimating applications. UniFormat also forms the basis for elemental cost estimating references like Yardsticks for Costing.

Keep exploring

Other ExAC reference books.

The NMS is one of several references on Examitect's ExAC study plan. Continue with the primary references.

CHOP

Canadian Handbook of Practice. The primary reference for specifications context: project delivery, construction documents, and the architect's obligations across every project phase.

CHING

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

NBC 2020

National Building Code of Canada. The primary reference for every category in ExAC Section 2, and the code backdrop for spec compliance in Section 3.

RSMeans

Construction cost data. Used for elemental estimating and cost-management questions in Section 1.

Yardsticks

Hanscomb Yardsticks for Costing. Canadian elemental cost data by building type and region, organized by UniFormat.

Supporting references

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