In a previous posting, we discussed CO detectors and the NC Statutory requirements for their installation.  I thought it might be helpful to spell out the actual code requirements as adopted in the 2009 NC Residential Building Code:

Section R313

Carbon Monoxide Alarms

 R313.1.1 Carbon monoxide alarms.  In new construction, dwelling units shall be provided with an approved carbon monoxide alarm installed outside of each separate sleeping area in the immediate vicinity of the bedroom(s) as directed by the alarm manufacturer.

R313.1.2 Where required – existing dwellings.  In existing dwellings, where interior alterations, repairs, fuel fired appliance replacements, or additions requiring a permit occurs, or where one or more sleeping rooms are added or created, carbon monoxide alarms shall be provided in accordance with Section 313.1.1.

R313.1.3 Alarm requirements.  The required carbon monoxide alarms shall be audible in all bedrooms over background noise levels with all intervening doors closed.  Single station carbon monoxide alarms shall be listed as complying with UL 2034 and shall be installed in accordance with this code and the manufacturer’s installation instructions.

Even though the Code only applies to new construction or where additions, alterations, renovations or replacements are made where a permit is required, adding one or more CO detectors to your existing dwelling is never a bad choice.