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Joined: Jul 2004
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I found the answer for the Florida building code, that is based on the ICC codes SECTION 1004 SMOKE ALARMS IN OCCUPANCY GROUPS R-3 AND R-4
1004.1 Smoke alarms in existing portions of a building. Whenever an addition is made to a building or structure of a Group R-3 or R-4 occupancy, the existing building shall be provided with smoke alarms as required by the Florida Building Code, Building or the Florida Building Code, Residential as applicable. The smoke alarms in the existing building are not required to be interconnected with smoke alarms in other portions of the base building
Greg Fretwell
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Joined: Jul 2004
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Over at Fl IAEI I got this citation. R313.2.1 Alterations, repairs and additions. When alterations, repairs or additions requiring a permit occur, or when one or more sleeping rooms are added or created in existing dwellings, the individual dwelling unit shall be equipped with smoke alarms located as required for new dwellings; the smoke alarms shall be interconnected and hard wired.
Exceptions:
1. Interconnection and hard-wiring of smoke alarms in existing areas shall not be required where the alterations or repairs do not result in the removal of interior wall or ceiling finishes exposing the structure, unless there is an attic, crawl space or basement available which could provide access for hard wiring and interconnection without the removal of interior finishes.
2. Work involving the exterior surfaces of dwellings, such as the replacement of roofing or siding, or the addition or replacement of windows or doors, or the addition of a porch or deck, are exempt from the requirements of this section."
Don't you love building codes?
Greg Fretwell
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Added was the key word & in orginal post the rooms were Additions so in that case Add but gets interesting if must be interconnected & no dectors rest of dewelling.
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Joined: Jul 2004
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The responder indicated that in his jurisdiction the rule was if you can get the wire in through the attic or a crawl space you will be putting in an interconnected alarm to all sleeping areas you can get to if one is added.
He even suggested a wireless solution if you can't get them all wired.
I am curious to see if there are other interpretations. Usually, no matter what, there is somebody who reads it another way.
Greg Fretwell
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Joined: Jul 2002
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Wireless smoke alarms?
Hmmm.
That would be OK, as long as all models of these were on the same frequency.
And that those down the track are on the same frequency as well, the last thing we need is smoke alarms that won't "talk" to one another.
I'd imagine that things like this might be over a 2.4GHz network (like everything else "wireless" seems to be these days).
Are Wi-Fi devices in homes going to blank these signals out, or on the other side of the coin, are these things going to muck up peoples Wi-Fi signal to the degree that they will disable the detectors?
Just an "off the bat" thought.
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Joined: Jul 2004
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I have never looked into them but they could be PLC. The only problem with that is your neighbor on the same transformer might get woken up every time you burn the toast.
Greg Fretwell
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I have never looked into them but they could be PLC. The only problem with that is your neighbor on the same transformer might get woken up every time you burn the toast. Good one Greg. At least over here every 3rd house is on the same phase, so they are never going to know what woke them up. Sounds like a diplomatic nightmare to me. 
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Joined: Dec 2002
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I suppose that some company could offer addressable-wireless smoke alarms. Sounds cheaper to pull wire or surface mount conduit or wireway.
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Joined: Jul 2004
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Florida has not gone far enough to ram wire mold down our throats but since the majority of houses are single story with an attic, anything mounted on the ceiling is generally accessible.
I know that to do this in my house was really only an extra hour or two and since I was up there anyway pulling in the extra circuits for my addition it was effectively less than that.
Greg Fretwell
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