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#96192 - 11/09/05 08:07 PM Seal up the holes
George Little Offline

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Does the electrical inspector ask that a "Listed" product be used to seal up the penetrations through the upper and lower plates of a non fire rated building such as a dwelling? What if the contractor uses fiberglass insulation stuffed in around NM cable to stop the flow of air from one floor to the next or in holes drilled horozontally? Would that satisfy the code?
George Little

2014 / 2011 NEC & Related Books and Study Guides
#96193 - 11/09/05 10:38 PM Re: Seal up the holes
gfretwell Offline


Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
I don't think that is fire rated, it is just an energy code thing.
They use spray foam here.
Greg Fretwell

#96194 - 11/10/05 07:41 AM Re: Seal up the holes
raider1 Offline

Registered: 07/08/05
Posts: 46
Loc: north logan, utah, US
The fiberglass would be acceptable if it is not a fire-rated floor or ceiling. All you are doing in a non-rated assembly is draft stopping, which can be done with non-conbustable insulation.


#96195 - 11/10/05 03:32 PM Re: Seal up the holes
George Little Offline

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Roger, would you and Bob (Iwire) comment on this subject? I respect your views and am trying to get a cross section of opinions. Thank You. And of course any others who have input by all means contribute.
George Little

#96196 - 11/10/05 04:08 PM Re: Seal up the holes
hbiss Offline

Registered: 12/16/03
Posts: 893
Loc: Hawthorne, NY USA
Around here they require a fire caulk or rock wool. It's not just an energy saving thing.


#96197 - 11/10/05 04:12 PM Re: Seal up the holes
Larry Fine Offline

Registered: 02/18/05
Posts: 684
Loc: Richmond, VA
Fire-stop caulk products are "bituminous"*, which means that they expand when heated, which closes penetrations when the cable burns away.

*(Or intuminescent, or whatever the word is)

[This message has been edited by Larry Fine (edited 11-10-2005).]
Larry Fine
Fine Electric Co.

#96198 - 11/10/05 04:43 PM Re: Seal up the holes
Roger Offline

Registered: 05/18/02
Posts: 1779
Loc: N.C.
George, first of all thank you for the respect and be assured it is mutual.

If it is a non rated building I wouldn't know of any reason to use a true fire sealant or caulk,.

One problem I have with people using a true fire caulk for sealing a penetration is, that if a manufacturers listed assembly using a particular caulk is not used, then it is nothing more than an expensive draft stop.

IMO, all of the assembly; the sheet rock, concrete, fire resistant plywood, ect... would have to be of some rating for the fire caulk to mean anything, unless there is some tested (listed) assembly where it was used with untreated wood.

For some assemblies go to the link below.

The assemblies are all there, but it is just not that easy to find what you are looking for, try clicking on the C-AJ assemblies.

Edit: I will try to fix the link.

I think the link will work now.


[This message has been edited by Roger (edited 11-11-2005).]

#96199 - 11/11/05 10:39 AM Re: Seal up the holes
Alan Nadon Offline

Registered: 03/10/05
Posts: 398
Loc: Elkhart, IN. USA
I look for Fire rated material only on fire rated assemblies. If they use it where not required I have no problem, I'm not paying for it.
In non-rated assemblies draft stopping with any material is O.K.
The draft stop can be at the top or the bottom or both.
If it was easy, anyone could do it.

#96200 - 11/11/05 12:46 PM Re: Seal up the holes
Electricmanscott Offline

Registered: 01/12/02
Posts: 1478
Loc: Holden, MA USA
George around here, {Mass) it is the building inspector that requires this. They want fire caulk in all vertical penetrations for residential construction. (That is waht I am familiar with) Even for a one room remodel. This is done by the GC not the electrician in my experience.

Sorry for my meager contribution.

Bow to Bob and Roger

#96201 - 11/11/05 12:53 PM Re: Seal up the holes
iwire Offline

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
George I do thank you for the kind words and rest assured I learn much from all your questions here.

I think you are an asset to ECN.

Now here are my thoughts on the question.

I don't know anything about it.

I use what is either in the job specifications or what the purchasing department gets me.

It is always true fire rated seal, but I suspect we use it for areas we really do not have to.

I defer to Roger on fire proofing he always seems to have the info at his fingertips.

Bob Badger
Construction & Maintenance Electrician

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