Signs you need this
- • Plans call for 1-hour or 2-hour rated walls — demising partitions, corridors, shafts, stair enclosures, or occupancy separations — and the GC needs a sub who builds to the listed UL assembly
- • A multi-family or mixed-use project around downtown New Haven or the medical district has fire-rating requirements on the punch list
- • An inspector or plan reviewer flagged a partition that isn't built to its rated detail, or fire-stopping that's missing at penetrations
- • A tenant separation, condo demising wall, or corridor needs to be brought up to its required rating
- • The owner/PM doesn't know which walls need what rating and needs it explained and executed correctly
What the service involves
Fire-Rated Drywall Assemblies for New Haven Commercial and Multi-Family Buildings
Fire ratings are one of the most misunderstood line items in commercial and multi-family construction, and that misunderstanding is the opportunity. The property managers, developers, and even some GCs who have to buy 1-hour and 2-hour walls often think of “fire-rated drywall” as a product — Type X board — when it’s actually a tested assembly. Around downtown New Haven, the medical district, and the mixed-use buildings going up across the inner-ring suburbs, the CT State Building Code and the IBC require rated demising walls, corridors, shafts, stair enclosures, and occupancy separations, and every one of them has to match a specific listed detail or it doesn’t pass.
A rating is an assembly, not a board
A UL-listed fire-resistance assembly specifies everything: the board type (Type X or Type C), the number of layers, the stud gauge and spacing, the fastener schedule, and how the joints are treated. Swap Type C for Type X where the listing calls for C, miss a layer, or use the wrong fastener spacing, and you no longer have the assembly that was tested — you have an unrated wall that happens to use fire-rated board. We build to the published listing for each wall on the fire-rating schedule, which is the only thing an inspector or plan reviewer is actually checking against.
Firestopping is where ratings are won or lost
A rated wall is only rated if the rating is continuous, and walls are full of holes — pipes, ducts, conduit, cable tray, and the joints where the wall meets the deck. Every one of those penetrations needs the correct listed firestop system, matched to what’s passing through and the rating required. This is the step that most often fails inspection, because it’s invisible once the wall is closed and easy to shortcut. We detail penetrations and joints with listed firestop systems as part of the assembly, and on penetration-heavy projects we coordinate with a dedicated firestop sub so nothing gets buried unsealed.
Inspection sequencing and documentation
The reason a rated-assembly sub earns trust is schedule certainty. We sequence framing, firestop, and cover inspections with the New Haven Building Department — or the relevant town’s department for shoreline and suburban projects — so cover-up never gets ahead of sign-off and the project doesn’t stall waiting to re-open a wall. At turnover we hand off the UL assembly references and firestop documentation the authority having jurisdiction needs for the certificate of occupancy. Whether it’s new rated partitions in a fit-out, shaft walls in a multi-family building, or bringing an existing demising wall up to code, what the GC or owner is buying is an assembly that matches its listing and passes the first time.
Materials & standards
Products & materials we use
- USG / National Gypsum / CertainTeed Type X and Type C fire-rated board
- Shaftliner board and C-H stud systems
- Listed firestop systems (e.g., 3M Fire Protection, Hilti firestop)
Standards & codes we work to
- UL fire resistance directory (listed assemblies)
- IBC Section 707 (fire partitions), 708 (fire walls/separations), 709, 713 (shafts)
- CT State Building Code 2022
- ASTM E119 (fire-resistance test basis)
- New Haven Building Department (and town departments) inspection sequencing
What the terms mean
- 1-hour / 2-hour rating; rated assembly
- Demising wall / occupancy separation / area separation
- Shaft wall / stair enclosure
- Firestopping / through-penetration / joint system
- Type X vs. Type C; multi-layer assembly; offset seams
- Fastener schedule per listing
Options & variants
| Option | When it applies | Cost |
|---|---|---|
| 1-hour rated partition | Demising walls, corridors, tenant separations | Baseline rated-assembly pricing |
| 2-hour rated assembly | Shafts, stair enclosures, area separations, higher occupancy separations | Higher — typically multi-layer, more labor |
| Shaft wall / area separation | Elevator/mechanical shafts, party walls | Specialized C-H stud + shaftliner systems |
| Type C (vs. Type X) board | Where the listed assembly specifies Type C for higher ratings | Material premium |
| Fire-rating remediation | Correcting a failed inspection or non-compliant existing wall | Scoped to the deficiency |
| Firestopping at penetrations | Required at every pipe, duct, cable, and joint through a rated assembly | Adds detailing labor; often coordinated with other trades |
What affects cost
- • Rating required — 2-hour assemblies usually mean multiple board layers and more labor than 1-hour
- • Assembly type — a shaft wall or area-separation system costs more than a standard rated partition
- • Board type — Type C and specialty fire-rated board carry premiums over standard Type X
- • Linear footage and height — more wall, and tall walls needing bracing, drive labor
- • Penetration count and firestopping — every pipe, duct, and cable through the wall needs detailed firestopping; dense MEP raises cost
- • Coordination and phasing — rated work that must sequence with other trades and inspections takes longer
- • Remediation access — correcting an existing non-compliant wall in an occupied building is more labor than building new
- • Documentation requirements — projects needing full UL-listing and firestop submittals for the AHJ add administrative scope
Price ranges
Low end
$4,000–$7,000
Limited run of 1-hour rated partition, standard Type X, modest penetrations.
Typical
$7,000–$11,000
Multiple rated partitions/corridors, mixed 1-/2-hour, firestopping, inspection coordination.
High end
$11,000–$16,000+
Shaft walls, 2-hour area separations, multi-layer assemblies, heavy firestopping, occupied-building remediation.
What to expect
- 1
Plan and rating review
We review the drawings and the fire-rating schedule: which walls, what rating, and the specified UL assembly for each. We confirm the listed detail (board type, layers, framing, fasteners) before building.
- 2
Layout and framing
Metal stud (or shaft-wall) framing set per the listed assembly, with the correct stud gauge and spacing the listing requires.
- 3
Rated board install
Type X or Type C board in the specified number of layers, with the listed fastener schedule and joint treatment. Multi-layer assemblies have offset seams per the listing.
- 4
Firestopping
Every penetration (pipe, duct, cable tray, conduit) and every joint detailed with the correct listed firestop system so the rating is continuous. This is where ratings are won or lost.
- 5
Inspection sequencing
We coordinate framing, firestop, and cover inspections with the GC and the New Haven Building Department (or the relevant town's department) so cover-up never precedes sign-off.
- 6
Finish
Taped and finished to the project's specified level; rated assemblies are finished like any wall on the visible side.
- 7
Documentation handoff
We provide the UL assembly references and firestop documentation the AHJ and the building owner need for the records and the certificate of occupancy.
When this isn’t the right call
- If it's a standard non-rated office partition → Conventional commercial drywall is the right, lower-cost scope. See: Metal Stud Framing & Commercial Drywall.
- If it's a residential garage fire separation → That's a specific code item covered separately. See: Garage Drywall & Fire Separation.
- If the project needs a dedicated firestop specialty contractor → On large, penetration-heavy jobs a firestop sub may handle that scope; we build the rated assemblies and coordinate.
- If it's a soundproofing requirement, not a fire rating → Different assembly and goal. See: Soundproof Drywall.
Frequently asked questions
Do you build to the actual UL listing, or just use fire-rated board? +
To the listing. A fire rating is a tested assembly, not a product — the right board type and layers, the specified framing and fastener schedule, and firestopping at every penetration, all matching a published UL detail. Using Type X board in the wrong configuration doesn't produce a rated wall, and an inspector knows the difference.
What's the difference between Type X and Type C drywall? +
Both are fire-rated, but Type C has additives that improve high-temperature performance and is required by certain listed assemblies, especially higher ratings and some shaft and ceiling details. We use whichever the listed assembly for your wall specifies.
Can you handle the firestopping at penetrations too? +
Yes. Every pipe, duct, conduit, and cable through a rated wall, and every joint, needs the correct listed firestop system or the rating is broken. We detail those penetrations as part of the assembly. On large penetration-heavy projects a dedicated firestop sub sometimes carries that scope; either way we coordinate so nothing is missed.
Will this pass inspection? +
That's the deliverable. We build to the listed assembly, sequence framing/firestop/cover inspections with the building department so nothing is covered before sign-off, and hand off the UL and firestop documentation the AHJ needs. We also correct failed inspections from prior work.
How do I know which walls in my building need to be rated? +
The architect's fire-rating schedule and the CT State Building Code / IBC drive it — demising walls, corridors, shafts, stair enclosures, and occupancy separations are the usual ones. If you don't have a clear schedule, we can walk the project and identify where ratings are required before quoting.
Can you upgrade an existing wall to a fire rating? +
Often, yes — by adding the layers and firestopping the listed assembly requires. It's more labor in an occupied building than building new, and sometimes the existing framing dictates the approach, but bringing a demising wall or corridor up to its required rating is common work.