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CSI MasterFormat Divisions

Reference Guide

To make this a professional-grade resource for your projects, we have integrated the specific 6-digit Section Numbers typically used in CSI MasterFormat. This level of detail is what architects and contractors look for when navigating project manuals.

I. General Requirements & Sitework

Division 00: Procurement and Contracting Requirements

  • 00 11 00 Invitations to Bid: Formal notices to contractors.
  • 00 41 00 Bid Forms: Standardized documents for submitting pricing.
  • 00 52 00 Agreement Forms: Legal contracts between Owner and Contractor.
  • 00 72 00 General Conditions: The "ground rules" (e.g., AIA A201).

Division 01: General Requirements

  • 01 31 00 Project Management and Coordination: Procedures for RFI and meetings.
  • 01 33 00 Submittal Procedures: Workflows for shop drawings, product data, and samples.
  • 01 50 00 Temporary Facilities and Controls: Job trailers, temporary power, and silt fencing.
  • 01 77 00 Closeout Procedures: Punch lists, final cleaning, and project record documents.

Division 02: Existing Conditions

  • 02 41 00 Demolition: Selective interior demo or total structure tear-down.
  • 02 82 00 Asbestos Remediation: Specialized handling of hazardous materials.

Division 31: Earthwork

  • 31 10 00 Site Clearing: Stripping vegetation and topsoil.
  • 31 20 00 Earth Moving: Excavation, backfill, and compaction testing.
  • 31 60 00 Special Foundations: Driven piles, caissons, and helical piers.

II. Facility Shell & Core

Division 03: Concrete

  • 03 10 00 Concrete Forming and Accessories: Formwork, liners, and ties.
  • 03 20 00 Concrete Reinforcing: Rebar and welded wire fabric (WWF).
  • 03 30 00 Cast-in-Place Concrete: Standard slabs, walls, and columns.
  • 03 40 00 Precast Concrete: Architectural panels and hollow-core planks.

Division 04: Masonry

  • 04 20 00 Unit Masonry: Concrete Masonry Units (CMU) and clay brick.
  • 04 40 00 Stone Assemblies: Granite, limestone, or marble veneers.
  • 04 70 00 Manufactured Masonry: Cultured stone and cast stone.

Division 05: Metals

  • 05 12 00 Structural Steel Framing: I-beams, columns, and girders.
  • 05 31 00 Steel Decking: Fluted metal sheets for floors and roofs.
  • 05 50 00 Metal Fabrications: Loose lintels, ladders, and bollards.

Division 06: Wood, Plastics, and Composites

  • 06 10 00 Rough Carpentry: Wall framing, floor joists, and blocking.
  • 06 20 00 Finish Carpentry: Trim, baseboards, and crown molding.
  • 06 41 00 Architectural Wood Casework: Custom cabinets and vanities.

III. Building Envelope & Finishes

Division 07: Thermal and Moisture Protection

  • 07 21 00 Thermal Insulation: Batt, spray foam, and rigid board.
  • 07 50 00 Membrane Roofing: EPDM, TPO, and PVC flat roofing.
  • 07 62 00 Sheet Metal Flashing and Trim: Copings and drip edges.
  • 07 92 00 Joint Sealants: Caulking and expansion joint fillers.

Division 08: Openings

  • 08 11 00 Hollow Metal Doors and Frames: Commercial steel doors.
  • 08 41 00 Entrances and Storefronts: Aluminum-framed glass systems.
  • 08 71 00 Finish Hardware: Locks, hinges, and exit devices (panic bars).

Division 09: Finishes

  • 09 29 00 Gypsum Board: Drywall installation and finishing.
  • 09 30 00 Tiling: Ceramic, porcelain, and quarry tile.
  • 09 51 00 Acoustical Ceilings: Drop ceilings and T-bar grids.
  • 09 65 00 Resilient Flooring: Luxury Vinyl Tile (LVT) and VCT.
  • 09 91 00 Painting: Interior and exterior coatings.

IV. Facility Services (MEP)

Division 21: Fire Suppression

  • 21 13 00 Fire-Suppression Sprinkler Systems: Wet-pipe and dry-pipe systems.

Division 22: Plumbing

  • 22 11 00 Facility Water Distribution: Domestic hot and cold water piping.
  • 22 40 00 Plumbing Fixtures: Sinks, toilets, and drinking fountains.

Division 23: HVAC

  • 23 05 93 Testing, Adjusting, and Balancing: (TAB) for airflow efficiency.
  • 23 31 00 HVAC Ducts and Casings: Metal and flexible ductwork.
  • 23 81 00 Decentralized HVAC Equipment: RTUs (Roof Top Units) and Split Systems.

Division 26: Electrical

  • 26 05 33 Raceway and Boxes for Electrical Systems: Conduit and junction boxes.
  • 26 24 00 Switchboards and Panelboards: Main electrical distribution.
  • 26 51 00 Interior Lighting: LED fixtures and emergency lighting.

Division 27: Communications

  • 27 10 00 Structured Cabling: CAT6 wiring and fiber optics.

Division 28: Electronic Safety and Security

  • 28 31 00 Fire Detection and Alarm: Smoke detectors and pull stations.

V. Specialized Divisions

Division Title Content Examples
10 Specialties Toilet partitions (10 21 13), Fire extinguishers (10 44 00)
11 Equipment Residential appliances (11 31 00), Loading dock bumpers (11 13 00)
12 Furnishings Roller shades (12 24 00), Entrance floor mats (12 48 00)
13 Special Construction Metal building systems (13 34 19), Cold storage rooms (13 21 00)
14 Conveying Equipment Electric traction elevators (14 21 00)
32 Exterior Improvements Asphalt paving (32 12 16), Irrigation (32 84 00)
33 Utilities Storm drainage piping (33 41 00)