OmniClass Table 41: Materials

OmniClass Table 41 classifies materials—the physical substances and material categories used to make construction products, assemblies, systems, and assets. Learn how Table 41 provides lifecycle classification, connects to MasterFormat and UniFormat, and how The Construction Standard provides licensed access to authoritative OmniClass data through CSI Dynamic Standards.

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Quick answer

OmniClass Table 41 – Materials provides lifecycle classification that spans design, construction, and operations. As part of CSI's comprehensive classification system, Table 41 delivers the taxonomy that BIM models, FM systems, and construction platforms need to organize materials data authoritatively.

What Table 41 Classifies

OmniClass Table 41 classifies materials—the physical substances and material categories used to make construction products, assemblies, systems, and assets.

This table classifies materials such as concrete, masonry, metals, wood, plastics, glass, gypsum, insulation, membranes, coatings, composites, soils, aggregates, and specialty materials.

Table 41 contains a detailed, consensus-based taxonomy that organizes this scope into categories and subcategories professionals can apply across projects. These classifications provide a shared vocabulary across the construction lifecycle. When teams apply Table 41 classifications consistently, data flows cleanly from design through construction into decades of facility operations.

Licensed through The Construction Standard, CSI Dynamic Standards includes the authoritative, always-current Table 41 classifications—searchable, cross-referenced to MasterFormat and UniFormat, and edition-aware.

The Lifecycle Role of Table 41

Table 41 material classification supports decisions from product selection through procurement, installation, sustainability reporting, maintenance, replacement, and end-of-life planning. Material data remains useful when it is connected back to specifications, products, and building elements.

Who Uses Table 41

  • Manufacturers describing product composition
  • Specifiers evaluating material requirements
  • Sustainability teams tracking material attributes
  • Software platforms organizing product and material data

Whether you tag BIM models, manage building assets, build construction software, or organize project data, Table 41 provides the authoritative classification that keeps your work consistent with the broader industry.

How Table 41 Connects to Other Standards

MasterFormat

Table 41 materials appear inside MasterFormat sections as product and performance requirements—concrete materials in Division 03, metals in Division 05, insulation and membranes in Division 07, and finishes in Division 09.

UniFormat

Materials from Table 41 compose UniFormat elements—a Shell (B) element may include concrete, steel, insulation, glass, membranes, and finish materials depending on the assembly.

These connections are maintained by CSI through governed relationships—not assembled ad hoc by individual project teams. Through The Construction Standard, licensed access to CSI Dynamic Standards gives teams these crosswalks so they can navigate between lifecycle categories, building elements, and specification sections without manual remapping.

Why OmniClass Matters for Long-Term Value

Buildings operate for decades. The classification applied during design and construction must carry into operations, maintenance, and capital renewal. OmniClass Table 41 provides the lifecycle layer that connects design-phase decisions to operations-phase reality—ensuring that structured data doesn't lose its value at handover.

Without authoritative lifecycle classification, FM teams rebuild taxonomy from scratch. Equipment histories lose their connection to original specifications. Capital renewal budgets lack the structured data needed for systematic planning. OmniClass Table 41 prevents these disconnects by providing classification that was designed to span the full lifecycle.

The Licensing Relationship

CSI—the Construction Specifications Institute—stewards OmniClass Table 41 as part of the OmniClass standard. CSI Dynamic Standards includes MasterFormat, UniFormat, and OmniClass as a connected, edition-aware system. The Construction Standard provides licensed access to CSI Dynamic Standards:

  • Always current: Classifications reflect the latest CSI-approved updates
  • Edition-aware: Teams know which edition applies and what changed between releases
  • Cross-referenced: Governed relationships to MasterFormat and UniFormat stay maintained
  • Integration-ready: Enterprise solutions carry Table 41 data into the tools you already use

Access Current CSI Standards

CSI Dynamic Standards provides authorized access to MasterFormat, UniFormat, and OmniClass through a connected, edition-aware platform. Create an account to view access options, or review pricing for organization-wide standards use.

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Sources and review scope

Reviewed against CSI’s public standards information for scope, terminology, and licensing context. This public guide provides orientation and does not reproduce or replace the licensed standard. Content review date: July 31, 2026.

COMMON QUESTIONS
Table 41 classifies this table classifies materials such as concrete, masonry, metals, wood, plastics, glass, gypsum, insulation, membranes, coatings, composites, soils, aggregates, and specialty materials. It provides the lifecycle taxonomy that connects design, construction, and operations data across the built environment.
Table 41 materials appear inside MasterFormat sections as product and performance requirements—concrete materials in Division 03, metals in Division 05, insulation and membranes in Division 07, and finishes in Division 09. Materials from Table 41 compose UniFormat elements—a Shell (B) element may include concrete, steel, insulation, glass, membranes, and finish materials depending on the assembly. CSI Dynamic Standards includes these governed relationships—licensed through The Construction Standard—so teams can navigate between OmniClass lifecycle categories, MasterFormat specification sections, and UniFormat building elements.
Manufacturers describing product composition, Specifiers evaluating material requirements, Sustainability teams tracking material attributes, Software platforms organizing product and material data—anyone who classifies, tags, organizes, or builds software that references materials data needs authoritative Table 41 classifications that stay current with consensus-based updates.
If your organization uses Table 41 classifications in BIM models, software platforms, databases, or deliverables that others rely on, CSI Standards licensing is necessary. The license ensures you're working with authoritative, CSI-approved classifications that stay current and maintain governed relationships to MasterFormat and UniFormat.

Explore closely related CSI divisions, standards, and construction classification topics.

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CSI Dynamic Standards includes MasterFormat, UniFormat, and OmniClass as a connected, edition-aware system. The Construction Standard provides licensed access—built for the speed of your work.

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