CSI Division
CSI Division 04 Masonry: section numbers and submittal deviations
What gets flagged between a Division 04 Masonry spec section and the submittal package, why it matters, and how each deviation is graded, so you can catch it before you send the package or before you approve it.
Short answer
Masonry is Division 04 in CSI MasterFormat, so its section numbers start with 04. Common sections include 04 20 00 Unit Masonry, 04 21 13 Brick Masonry, and 04 22 00 Concrete Unit Masonry. Its submittals deviate most often on product substitutions, performance ratings, and missing certifications.
Division 04 covers masonry construction in commercial buildings: concrete masonry units (CMU), brick, stone, mortar, grout, reinforcing, and related accessories. Common CSI sections submitted for review:
Division 04 Masonry CSI section numbers
Division 04 Masonry spec sections frequently submitted for review:
| Section | Title |
|---|---|
04 05 00 | Common Work Results for Masonry |
04 05 13 | Masonry Mortaring |
04 05 16 | Masonry Grouting |
04 05 19 | Masonry Anchorage and Reinforcing |
04 05 23 | Masonry Accessories (ties, anchors, flashing, weeps, control joints) |
04 20 00 | Unit Masonry |
04 21 13 | Brick Masonry |
04 22 00 | Concrete Unit Masonry (CMU) |
04 22 23 | Reinforced Unit Masonry |
04 23 00 | Glass Unit Masonry |
04 27 00 | Multiple-Wythe Unit Masonry |
04 40 00 | Stone Assemblies |
04 42 00 | Exterior Stone Cladding |
04 43 00 | Stone Masonry |
04 72 00 | Cast Stone Masonry |
Sending a Division 04 package? Run the free Division 04 pre-submittal checklist first. It prints or downloads as a PDF, no email required.
The six deviation categories in Division 04 Masonry
Every issue Deviation Check flags maps to one of six categories. Here is how each appears in Division 04 Masonry submittals, with the full guide one click away.
Manufacturer or Product Substitution
Blocker The submittal proposes a different manufacturer or product than the spec names, without an approved or-equal or substitution request.
Masonry specs name specific unit manufacturers, mortar producers, and accessory suppliers. Look for:
Manufacturer or Product Substitution in Division 04 Masonry submittals →
Performance Specification Gap
Blocker A measurable performance property in the submittal (rating, capacity, tolerance, efficiency) does not meet what the spec requires.
Key performance parameters in masonry submittals:
Performance Specification Gap in Division 04 Masonry submittals →
Missing Certification or Compliance Documentation
Fix and Resubmit A required listing, test report, certification, or compliance document is absent from the submittal package.
Required certifications in masonry submittals:
Missing Certification or Compliance Documentation in Division 04 Masonry submittals →
Aesthetic Deviation
Fix and Resubmit A visible attribute (color, finish, texture, profile) differs from the spec or the architect-approved sample.
Aesthetic Deviation in Division 04 Masonry submittals →
Detail or Installation Mismatch
Fix and Resubmit The submitted detail, dimension, anchorage, or installation method differs from what the spec or drawings require.
Detail or Installation Mismatch in Division 04 Masonry submittals →
Submittal Package Incompleteness
Fix and Resubmit A required submittal element (cut sheet, schedule, calculation, sample) is missing, leaving the package unreviewable as submitted.
Commonly required items in Div 04 specs:
Submittal Package Incompleteness in Division 04 Masonry submittals →
How Division 04 deviations are graded
Each finding is graded Blocker, Fix and Resubmit, or Note. Division 04 escalation rules:
- CMU compressive strength below spec f'm: BLOCKER (structural capacity per TMS 402)
- Brick grade below weathering requirement (MW where SW specified): BLOCKER (freeze-thaw durability)
- Mortar type below spec (Type N where Type S specified): BLOCKER (structural capacity and weather resistance)
- Grout strength below spec: BLOCKER (structural capacity for reinforced masonry)
- Reinforcing grade below spec: BLOCKER (structural per TMS 402)
- Missing fire rating documentation for rated assembly: BLOCKER (life-safety)
- Missing seismic compliance for reinforced masonry: BLOCKER (IBC)
- Wall tie type or spacing non-compliant with TMS 402: BLOCKER (structural connection of wythes)
- Through-wall flashing omitted where spec requires: BLOCKER (water infiltration, structural damage)
- CMU weight class mismatch (lightweight where normal weight specified for structural): BLOCKER if structural, FIX_AND_RESUBMIT if non-structural
- Brick color or texture mismatch: FIX_AND_RESUBMIT (aesthetic)
- Mortar joint profile mismatch: FIX_AND_RESUBMIT (aesthetic)
- Missing efflorescence test results: FIX_AND_RESUBMIT (quality assurance)
Run a Division 04 submittal review
Upload a Division 04 spec section and your submittal package before you send it, and get a one-page deviation report in under five minutes, so the package goes through the first time. GC reviewers use it the same way on a package that just arrived. Before that, work through the free Division 04 checklist.
Frequently asked questions
What is the CSI code for masonry?
Masonry is CSI MasterFormat Division 04, and every section number in it starts with 04. Common sections include 04 20 00 Unit Masonry, 04 21 13 Brick Masonry, 04 22 00 Concrete Unit Masonry, 04 22 23 Reinforced Unit Masonry, and 04 23 00 Glass Unit Masonry. Type any number into the CSI division lookup to decode it.
What is Division 04 Masonry in construction?
Division 04 covers masonry construction in commercial buildings: concrete masonry units (CMU), brick, stone, mortar, grout, reinforcing, and related accessories. In a CSI MasterFormat spec, its sections carry the submittal and product requirements a Division 04 package is reviewed against.
What are the most common deviations in Division 04 Masonry submittals?
The most common are product or manufacturer substitutions, performance specification gaps, and missing certification or compliance documentation. Deviation Check sorts every finding into one of six categories.
How are Division 04 deviations graded?
Each finding is graded Blocker (resolve before approval), Fix and Resubmit (correct and re-send before fabrication or install), or Note (acceptable with a comment).
View this page as Markdown for LLMs and note-taking.