Supporting Reference

National Master Specification (NMS) for the ExAC

The National Master Specification (NMS) is Canada's master library of construction specification sections, published by the National Research Council of Canada (NRC) and organized by MasterFormat. Examitect recommends the NMS as a supporting resource for Section 3, objective 8.5: Understand the principles of specification writing, and in particular sub-objective 8.5.1, Explain the connection between the MasterFormat and the National Master Specification (NMS).

Try a free ExAC practice question See plans

NMS overview

NMS at a glance

Full titleNational Master Specification
PublisherNational Research Council of Canada (NRC)
Distributor in CanadaNational Building Specifications (NBS), with RAIC partnership for member access
In useOver 35 years in Canadian practice
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 by discipline
ExAC placementExamitect-recommended supporting reference, Section 3 objective 8.5 (Understand the principles of specification writing), sub-objective 8.5.1

Why NMS matters for the ExAC

The NMS is Canada's master library of pre-written construction specification sections. Every procedure, product, and method an architect is likely to encounter on a Canadian project has a corresponding NMS section, organized by MasterFormat. Knowing the NMS means knowing how the specification system works, not what any one section says verbatim.

Sub-objective 8.5.1 asks candidates to explain the connection between the MasterFormat and the National Master Specification. That tells you what the exam expects: a working knowledge of how the NMS is organized and what each Division covers, not word-for-word spec memorization.

The NMS also provides the vocabulary that shows up across Section 3 and Section 4 questions: MasterFormat Division numbers, the three-part section format, submittals, and substitutions. Familiarity with even a handful of NMS sections builds that vocabulary in context.

How to study NMS for the ExAC

  • Map the Divisions before reading anything. Know that Division 07 is thermal and moisture protection, 08 is openings, 09 is finishes. That reflex pays off on timed questions.
  • Read one Division 01 section end to end to see the full range of administrative procedures: submittals, substitutions, payment, and project closeout.
  • Trace a wall assembly from CHING to its NMS Divisions (07 for envelope, 08 for windows, 09 for finishes). That drawing-to-spec connection is exactly what the exam tests.
  • Know which Part answers which question. Submittals are in Part 1. Products are in Part 2. Installation methods are in Part 3.
  • Pair NMS study with CHOP Chapters 2.5 and 6.4. CHOP explains the specifier's role; the NMS shows the actual text structure.

ExAC sections NMS supports

  1. Section 3

    Sustainability and final project. Examitect recommends the NMS as supporting reading for objective 8.5, Understand the principles of specification writing, and specifically sub-objective 8.5.1. Questions focus on how MasterFormat organizes specification sections and what the three-part format contains.

  2. Section 4

    Construction and practice. Examitect does not map the NMS to Section 4, but Division 01 content is directly relevant to construction office function questions on submittals and substitutions.

Inside the NMS: The MasterFormat Division Structure

The NMS uses MasterFormat numbering throughout. Every spec section gets a unique number: six digits for most sections, eight digits when additional sub-classification is needed. The Construction Specifications Institute (CSI) and Construction Specifications Canada (CSC) maintain MasterFormat jointly. In 2004, MasterFormat expanded from 16 Divisions to more than 40 Divisions. That history matters for ExAC candidates because older firm templates and some exam scenarios still reference the 16-Division structure.

Division What it covers ExAC relevance
Division 00
Procurement and Contracting Requirements		 Bidding forms, instructions to bidders, the owner-contractor agreement, and other pre-contract documents. Connects to Section 4 questions on bidding and contract award. Pairs with CCDC 2.
Division 01
General Requirements		 Administrative rules for the entire project: submittals, substitutions, temporary facilities, payment procedures, project closeout, and quality requirements. Very high. Division 01 administrative language appears across Section 3 (construction documents) and Section 4 (construction office functions) questions.
Divisions 02 to 14
Traditional architectural scope		 Existing conditions, concrete, masonry, metals, wood, plastics and composites, thermal and moisture protection, openings, finishes, specialties, equipment, furnishings, special construction, and conveying equipment. High. Divisions 07 (envelope), 08 (openings), and 09 (finishes) connect to Section 3 questions on assemblies and construction documents.
Divisions 21 to 28
Facility services		 Fire suppression, plumbing, HVAC, integrated automation, electrical, communications, and electronic safety and security. Moderate. Typically assigned to consulting engineers. Understanding scope supports engineering coordination questions.
Divisions 31 to 35
Site and infrastructure		 Earthwork, exterior improvements, utilities, transportation, and waterways. Low to moderate. Site work context for Section 1 and Section 3; Division 31 and 32 appear in landscape and civil coordination scenarios.
Division 40 and above
Specialized industrial		 Process equipment, pollution control, and other specialized categories less common in general architectural practice. Rarely tested on the architectural ExAC.

The NMS Architectural library is the discipline-specific set most relevant to ExAC candidates. It covers Divisions 00 through 14 plus Divisions 31, 32, and 33, and also includes UniFormat-based content for performance specifications on design-build and other projects. Other discipline libraries (Building Services, Structural, Mechanical, Electrical, Engineering, Conservation, Landscape Architectural, Interior Design, Heavy Civil, and Air Transportation) cover work typically led by engineering consultants and by specialists in conservation, landscape architecture, and interior design. Knowing that these libraries exist helps you understand the full scope of a coordinated set of project specifications and why specification coordination is part of the architect's role.

Key NMS terms every ExAC candidate should know

These terms appear across Section 3 and Section 4 questions. Know them cold before exam day.

TermWhat it means
MasterFormatThe standard classification system for construction information, organized by Division and section number. Maintained by CSI and CSC. Expanded from 16 to 40+ Divisions in 2004.
Division 00Procurement and Contracting Requirements. Contains bidding forms, instructions to bidders, and the owner-contractor agreement. The contract's front-end documents.
Division 01General Requirements. Sets the administrative rules for every subsequent Division: submittals, substitutions, temporary facilities, payment, and project closeout.
Three-part section formatThe standard internal structure for every NMS section: Part 1 General (administrative), Part 2 Products (materials and fabrication), Part 3 Execution (installation and quality control).
SpecifierThe person who writes and coordinates the project specification. On most Canadian projects this is the architect, a consultant, or a specialized specification writer working under the architect's direction.
SubmittalA document or sample the contractor provides for the architect's review: shop drawings, product data sheets, or material samples. Review confirms the proposed item meets the contract documents.
SubstitutionA contractor's request to use a product or method different from what the spec names. Division 01 sets when substitutions may be requested and how the architect evaluates them.
Prescriptive specificationA spec that names specific products or manufacturers. Gives the architect tight control over quality but limits contractor flexibility.
Performance specificationA spec that states the required outcome or standard rather than naming a product. Allows contractors to propose equivalent solutions that meet the stated criteria.
UniFormatA classification system organized by building element rather than by trade. Used in the NMS Performance library and in elemental cost estimating references like Yardsticks for Costing.
SectionFormatThe standard internal outline that defines the three-part structure and content sequence within each spec section. Published alongside MasterFormat by CSI and CSC.
NBS ChorusThe cloud-based platform through which the NMS is currently delivered. Available on Mac, Windows, tablets, and phones. Replaced SPECedit as the primary delivery channel.

Tips for Intern Architects reading the NMS

Most Intern Architects in the Internship in Architecture Program (IAP) encounter specifications on the job before they study them for the Examination for Architects in Canada (ExAC). Here is how to connect both experiences.

Tip 1, read the spec on your current project. Pull up the Division 01 section for a live job. That is not an abstraction; it governs how the project runs right now. Reading it in context makes the administrative procedures stick faster than any textbook exercise.

Tip 2, study the reviewer's role, not just the writer's. ExAC questions about specifications are not about how to write a spec section from scratch. They are about how the architect reviews submittals, evaluates substitution requests, and coordinates spec sections with drawings. Focus your study on those review obligations.

Tip 3, learn Division numbers as reflexes. When a question mentions Division 07 or Division 09, you should know the scope without pausing. Build a quick mental map: Division 01 is admin, Division 03 is concrete, Division 07 is envelope, Division 09 is finishes, Division 26 is electrical. That reflex saves real time on a timed exam.

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

Tip 5, ask a senior architect or specifier to walk you through one section. If your office uses the NMS, twenty minutes watching someone edit a master section for a real project is worth a week of independent reading. You see what they keep, what they cut, and how they confirm spec-drawing alignment in one sitting.

Tip 6, go deep on Division 07 for Section 3. Thermal and moisture protection shows up often in construction document and building science questions. Read a Division 07 section (air barrier, exterior insulation, or roofing membrane) alongside the corresponding Part 5 and Part 9 provisions in the NBC 2020. The two documents tell the same story from different angles.

Common ExAC scenarios where NMS knowledge applies

These question types connect directly to how specifications work in practice. When you see one, your first question should be: what does the spec say, and who is responsible for it?

  • A contractor requests a substitution for a specified roofing membrane after contract award. The substitution process is defined in Division 01 General Requirements. What are the architect's obligations, and within what timeline must the architect respond?
  • A shop drawing for a curtain wall system does not match the specification. The architect returns the drawing stamped "reviewed" without noting the discrepancy. What are the potential consequences under a standard Canadian construction contract?
  • The drawings show a cladding detail that conflicts with the Division 07 specification section for the same assembly. The contract is a standard stipulated price contract. Which document takes priority, and why?
  • An Intern Architect is asked to write a spec section for a new commercial project. The project uses a structural steel frame with a glass and metal curtain wall. Which MasterFormat Divisions cover the structural steel, the curtain wall, and the sealants?
  • A client asks whether a less expensive alternative product satisfies a performance-based spec section. The section names a performance standard but does not name a specific manufacturer. What must the architect confirm before the contractor proceeds?
  • During construction, a material substitution approved through Division 01 turns out to require a different installation method than the original product. Who is responsible for confirming that the Part 3 execution requirements still apply to the substituted material?
  • A new Intern Architect is reviewing a project specification written using the old 16-Division MasterFormat structure. The current office template uses the 40+ Division structure. What changed in 2004, and roughly how does Division 07 in the old system map to the current structure?

How the NMS compares to other ExAC references

The NMS is a specialist tool focused on specification structure. It overlaps little with the primary ExAC references, but it connects to several of them.

ReferenceWhat it's forHow it relates to the NMS
NMS The master library of pre-written specification sections, organized by MasterFormat. The reference standard for spec structure, Division organization, and administrative vocabulary on the ExAC.
CHOP The RAIC's handbook on architectural practice: project delivery, contracts, construction documents, and the spec writer's role. CHOP explains why specs exist and what the architect's obligations are. The NMS is the actual text library. Read CHOP Chapters 2.5 and 6.4 for context, then look at NMS sections to see the structure in practice.
CHING Visual 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 maps to NMS sections in Division 07 (envelope), 08 (openings), and 09 (finishes).
NBC 2020 The national model building code: minimum performance requirements for materials and assemblies. The NBC sets the compliance floor that spec sections must meet. Division 07 sections for air barriers and insulation must align with NBC Part 5 and Part 9 performance requirements.
Architectural Graphic Standards Reference for drawing conventions and classification systems, including MasterFormat, UniFormat, and SectionFormat. Examitect pairs Architectural Graphic Standards with the NMS for objective 8.5, as its companion for MasterFormat, UniFormat, and SectionFormat context. AGS explains the classification context; the NMS uses MasterFormat numbering throughout.

How Examitect reinforces NMS knowledge

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 concepts, the answer explanation traces the reasoning back to the relevant framework: the Division 01 administrative structure, the three-part section format, or the relationship between specs and drawings. You learn the principle, not just the answer.

The full question bank includes Section 3 and Section 4 practice questions, free study notes by section, and mock exams paced to match the real ExAC. Try a few free questions first, then check pricing when you want the full set.

FAQ

NMS FAQ

The NMS is Canada's master library of pre-written construction specification sections, published by the National Research Council of Canada and organized using MasterFormat. It covers every procedure, product, and method an architect is likely to encounter on a Canadian project. Architects and specifiers use it as a starting point, editing the pre-written sections to match each project's specific requirements.

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

MasterFormat is the standard classification system for organizing construction information 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 sections numbered using 6 or 8 digits. The NMS is organized entirely by MasterFormat numbering.

Supplementary. The 2026 ExAC Preparation Guide names four primary reference documents, CHOP 2020, the IAP, NBC 2020, and NECB 2020, and publishes no reference list at objective level. Examitect places the NMS under Section 3, objective 8.5 (Understand the principles of specification writing), and what you need from it is the Division structure and the three-part section format, not the full content library.

Only the structure. Sub-objective 8.5.1 asks you to explain the connection between the MasterFormat and the National Master Specification, so what the exam expects is a working knowledge of how the NMS is organized and what each Division covers, not word-for-word memorization of spec content.

Every NMS section follows a standard internal structure. Part 1 (General) covers administrative and procedural requirements: submittals, referenced standards, quality assurance, and delivery and storage. Part 2 (Products) covers materials, fabrication requirements, and acceptable manufacturers. Part 3 (Execution) covers installation methods, field quality control, adjusting, cleaning, and protection. The ExAC tests this structure directly, asking which Part addresses a given type of requirement.

MasterFormat organizes construction information by material and trade: concrete is Division 03, masonry is Division 04, and so on. UniFormat organizes construction information by building element: substructure, shell, interiors, and services. The NMS Performance library uses UniFormat numbering and is used for design-build and other applications. UniFormat also underlies elemental cost estimating references like Yardsticks for Costing.

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, the 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.

Keep exploring

Other ExAC reference books.

The NMS is one of several references on Examitect's reading list. Continue with the Preparation Guide's primary reference documents and the rest of Examitect's list.

CHOP

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

CHING

Building Construction Illustrated. The visual reference for assemblies, materials, and detailing. Pairs directly with NMS Divisions 07, 08, and 09.

NBC 2020

National Building Code of Canada. The primary reference for ExAC Section 2, and the code compliance backdrop for NMS spec sections in Division 07.

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.

NECB

National Energy Code of Canada for Buildings. Supports the envelope and energy questions in Section 2.

Supporting references

Examitect's extended reading list of supporting references, mapped by Examitect to the official ExAC objectives.