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#154106 - 04/12/04 04:32 PM Firestopping - Y/N/?
DougW Offline

Registered: 06/08/03
Posts: 1083
Loc: North Chicago, IL
During a training session on building construction and fire spread, the concept of firestopping came up. Of course, they picked on the "wire monkey" in the room, and used an example of a cap plate cut through 2" wide to run a 1/2" EMT as how not to prevent the spread of fire. How many of your AHJ's require firestopping in residences?

We all know that "listed" occupancies (hospitals, schools, commercial, and classified Hazardous locations) require it when penetrating rated walls, but how many of your municipalities take it that extra step, and require it in single family homes?

Here in IL (Lake County), it's really a city-by-city thing. My home town doesn't, but two towns south does.

Ideas, comments, questions?

Building Codes & Related References
#154107 - 04/12/04 04:45 PM Re: Firestopping - Y/N/?
iwire Offline

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
It was just getting to be an issue in 84 or 85 when I was last doing that kind of work.

It would be taken pretty serious all holes would get fire sealed.

At the time the GCs where handling it which could be frustrating, drill a bunch of holes come back latter and the GCs laborer already fire stopped it.
Bob Badger
Construction & Maintenance Electrician

#154108 - 04/13/04 03:01 PM Re: Firestopping - Y/N/?
Roger Offline

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Doug, it is a requirement here. The top plate is not required to have a glorified fire caulk only a draft stop to prevent a "chimney" effect.

Walls of attached garages are treated as full blown fire walls.


#154109 - 04/17/04 03:23 PM Re: Firestopping - Y/N/?
nesparky Offline

Registered: 06/21/01
Posts: 650
Loc: omaha,ne
It is required here by the framing inspectors not the electrical inspectors. Some CGs want you to firestop what holes you drill and others give that task to the insulators ( where it belongs IMHO).

#154110 - 05/16/04 03:29 AM Re: Firestopping - Y/N/?
PCBelarge Offline

Registered: 06/08/03
Posts: 657
Loc: Dobbs Ferry, NY, USA
Here they do not care who performs the firestopping, as long as it is firestopped before the electrical inspection. Dwelling firestopping has been strictly enforced here for a while, recently, the have made the HVAC contractors firestop their gaping (and small)penetrations... needless to say they are pissed.

Pierre Belarge

#154111 - 09/18/04 06:31 AM Re: Firestopping - Y/N/?
Trumpy Offline


Registered: 07/05/02
Posts: 8532
Loc: SI,New Zealand
That's a very good question!.
Fire Caulking is an important part of any building.
It's amazing just how an un-caulked opening in a wall can cause a heap of damage during a fire.
We are required to seal any openings we make in walls, floors, ceilings and the like before we leave the site.
Let's face it, these days if you're not young, you're old - Red Green grin

#154112 - 09/18/04 02:25 PM Re: Firestopping - Y/N/?
chi spark Offline

Registered: 01/06/04
Posts: 102
Loc: Chicago IL USA
Yes in most Chicago suburbs- mostly caught by framing inspection- usually done by GC crew guy for all trades, to be sure it is done.

#154113 - 10/28/04 05:40 PM Re: Firestopping - Y/N/?
earlydean Offline

Registered: 12/22/03
Posts: 749
Loc: Griswold, CT, USA
That is why the building code requires the framing inspection to be made after the electrical, plumbing and mechanical rough inspections. The GC can require each trade to do their own firestopping of their penetrations, or he can seal them up himself.

#154114 - 12/17/04 02:47 PM Re: Firestopping - Y/N/?
Coastal Offline

Registered: 12/17/04
Posts: 22
Loc: Kill Devil Hills, NC 27948
Here, in Dare County NC, all holes in both the top and bottom plates must be fire-caulked prior to the "Rough-In' inspection. The caulking is done by the Insulation Contractor who comes in after all the mechanics; to fire-caulk only. They (Insulators) then come back after the "Rough-In" to insulate and the insulation must then be inspected before the drywall goes on.

#154115 - 12/17/04 02:55 PM Re: Firestopping - Y/N/?
Joe Tedesco Offline

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
See the 2002 NEC Index, and although it is not complete, these are the rules that apply to the question: The AHJ who does not enforce these rules will lose the battle in a courtroom.

Fire spread
Prevention of, wiring methods,
300.21, 725.3(B),
760.3(A), 770.3(A),
800.52(B), 820.52(B),
Fire-stopped partitions, 300.21.
see also Firewalls
Joe Tedesco, NEC Consultant


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