A Rating Is Only as Good as the Installation
A fire-resistance rating comes from a tested, listed assembly, and the protection depends on every component being installed as the listing requires. A wall that looks complete on the drawings can still fail if it stops at the ceiling, uses substituted materials, or is breached by later trades.
Paul Gaston reviews whether rated construction, fire walls, fire barriers, fire partitions, and shaft enclosures, was built to meet the applicable code and the listed design, for plaintiff and defense counsel in Chicago and Cook County.
Where Rated Assemblies Break Down
Continuity and completeness are where most rated-wall failures hide:
- Walls that stop at the ceiling instead of the deck
- Substituted or missing listed materials
- Unprotected openings in the assembly
- Unsealed through-penetrations and membrane penetrations
- Improper or missing head-of-wall joints
- Breaches cut by later trades and left unrepaired
- The wrong separation type for the required rating
Most rated-wall failures are not visible from the room. They are above the ceiling, where the wall was supposed to continue to the deck and never did.
Proving the As-Built Departs From the Listing
The review starts by determining the required separation and rating for the condition under the governing code, then identifying the listed assembly the construction was meant to match. The as-built condition is inspected, including concealed areas above ceilings, for continuity and correct components.
Openings, penetrations, and joints within the assembly are evaluated against the listing and code, and departures from the listed design are documented, while installation questions are kept separate from fire-protection engineering design.
How Paul Gaston Helps Resolve the Dispute
Paul delivers documented findings that connect the field condition to a specific rating requirement and listed design, for plaintiff and defense. His work includes photographs of concealed and finished conditions and a clear account of where the assembly departs from what the code and listing required.
When a dispute turns on whether rated construction was actually built to perform, that evidence supports a claim or a defense and holds up under cross-examination.
Frequently Asked Questions
Why are fire-rated wall failures so often hidden above the ceiling?
Rated walls are required to continue to the floor or deck above, but the space above a suspended ceiling is out of sight and easy to shortcut. Walls that stop at the ceiling, or that later trades breach, commonly fail there while looking complete from the occupied room.
Can a single unsealed penetration void a wall's fire rating?
A penetration that is not protected with the correct listed firestop can compromise the assembly's performance at that location. Whether it undermines the rating depends on the condition and the listing, which is exactly what the inspection and analysis are designed to establish.
How do you prove a rated wall was never built to its listed design?
By identifying the listed assembly the wall was supposed to match, then documenting the as-built condition, materials, continuity, openings, and joints, against that listing. Photographs of concealed conditions and comparison to the code and listing show where the installation departed.