This is the basement of a house? Once the building has a "dwelling
unit", the whole building is a "dwelling", so there is no blanket
requirement for a 15-minute finish. For residential property, the
requirement for a 15-minute finish is only for detached buildings such
as sheds, garages, etc.
That all assumes your AHJ doesn't consider an accessory building to a
dwelling as part of the dwelling. (AKA "residential")
When you don't it brings up all sorts of zoning and other code issues.
In most counties in Florida you will have to get a limited
development order to build a shed that is not part of a dwelling.
I guess the good news is you won't need AFCIs or GFCIs because the
"accessory building" is not part of a "dwelling" re: 210.8(A)(2) ;-)
On Wed, 21 Jan 2009 02:08:40 -0500, email@example.com wrote:
"dwelling" - not commercial, industrial, agricultural or
So as long as the garage/shed is not for "commercial" use, or
"agricultural" use, the romex can be exposed, but not surface mounted
Right idea but wrong lobby. I looked back at information from the code
change (ROP and ROC).
There was a task group that looked at the change (allow Romex in
buildings above 3 floors), but it didn't have enough votes to bring a
proposal to the code making panel.
Multiple proposals were brought to the code making panel for the 2002
NEC by the National Multi-Housing Council. (There were proposals from
some others including Massachusetts.) This was a major effort to change
the code, probably aimed primarily at housing costs. The code making
panel (which included a representative from the National Multi-Housing
Council) rejected the changes (for good or bad reasons). So did the NFPA
annual member meeting. The change was forced through by 'extraordinary'
Apparently manufacturers have never argued for the change. The the NEMA
Building Wire Technical Committee unanimously voted to oppose the change.
The change allows Romex to be used in residential structures over 3
floors - the major change that was pushed.
It also allowed Romex to be used in 'other' structures (like commercial)
over 3 floors but added the 15 minute wall rating. This wall rating did
not previously exist for 'other' structures less than 3 floors.
Since the change, the code making panel has (understandably) refused to
make changes (such as exempt garages).
I doubt you will find many inspectors that think a 15 minute wall rating
is useful in a garage or shed. I suspect most inspectors will ignore the
restriction, just as they modify other code that can result in
unreasonable requirements in a particular instance.
But a detached garage is a commercial space? Industrial? It is really
difficult to write any code that applies to 'every thing'. That is one
reason the NEC changes every 3 years. And why the AHJ is given final
I don't know what a detached garage is (Occupancy U in the building
code?) but it is not a dwelling as far as the NEC is concerned. From
Dwelling, One-Family. A building that consists solely of
one dwelling unit.
Dwelling Unit. A single unit, providing complete and independent
living facilities for one or more persons, including permanent
provisions for living, sleeping, cooking, and sanitation.
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