A friend of mine had some rehab work done on a one-story single-family
ranch-style home, and the local inspector cited some "fire blocking" issues.
My understanding is that the actual citation was for "not fireblocking all
penetrations of wires, ducts and plumbing". I think it was in reference to
where the wires, ducts, and plumbing go through the ceiling and into the
attic space, but I am not sure. This makes sense to me, since I assume the
point is to prevent a fire from spreading from the living area into the
attic space and roof area.
Is there any particular type or brand caulk etc. that is usually used to
seal these openings and meet the code requirements? If some of the openings
are too large for caulk, are there other techniques that are used to seal
the openings and meet the code requirements?
And, just out of curiosity, my friend was trying to find where he could read
the actual building, fire, or construction code citations about this to see
what they say. He was looking at the International Residential Code (IRC)
but couldn't find it there. Can anyone point out any actual code citations
about this that I could pass on to him from the IRC, or National Electrical
Code, or International Plumbing Code, or wherever? He (like me) likes to
see the actual code references to see what they say, but we are having a
hard time locating the specific code citations.
When last looking for caulk at HD I noticed there were
ones specifically rated for fire blocking applications.
Also, I think they had expanding foam type products too.
But the best source for what to use and where I would
start is the inspector who apparently had issues and
cited it. Whatever we think or even what some code
book says is almost always trumped by the actual
inspector. And this is one of those things that is a lot
easier to do right the first time than do over.
a.. Youth ages, immaturity is outgrown, ignorance can be educated,
drunkenness sobered, but stupid lasts forever.
a.. Fictional attribution in the movie The Emperor's Club (2002), given
by Kevin Kline (as William Hundert); also attributed to Diogenes, without
sources; no published occurrences of this statement prior to the movie
have been located in any of the Aristophanes Plays or Fragments.
*Home Depot sells firestop caulk in 1 hour, 2 hour and 3 hour ratings and
each one is a different color for identification by an inspector. For
larger holes I fill in with mineral wool insulation and then cover with 3
hour firestop caulk. You could also use cement on its own as was done many
moons ago. For big openings, a layer or two of 5/8" drywall should do it.
I don't know which code book the firestop requirements are in, but there is
not much on the subject in the NEC. Contact your building department for a
reference since your city and state may also have their own requirements.
On Sat, 10 Nov 2012 18:05:19 -0500, "John Grabowski"
Penetration fire protection becomes a listed assembly and U/L has a
bunch of approved one. Just squirting some caulk in the hole is not a
Here is a movie from U/L about fire stopping but be sure your AHJ is
not mis speaking and he really wants draft stopping.
Usually that is all you need in a residence unless you are above a
Thanks. Someone on another forum (non-Usenet) posted this information:
"I believe NJ follows the 2009 International Residential Code (IRC) New
Jersey Edition for single family residential dwellings like you are
describing. Fireblocking is covered in Section R302.11. Of course local
Townships often put their own spin on the requirements and at the end of the
day, just like judges in landlord/tenant court, it is often the inspector's
interpretation of the code that becomes "law" for that particular
Here is a link to the 2009 IRC-NJ for your reading pleasure:
I read that section of the code, it pretty much spells it all out. Italso
includes information about what materials can be used for fireblockingetc.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.