The 2015 International Residential Code (R314.3) specifies required locations for smoke alarms. Prior code editions have required smoke alarms to be located at three specific locations; in each sleeping room, outside of bedrooms and on each story. A fourth location has now been added but unlike the first three, this location references an area where smoke detectors cannot be placed. This new requirement does not allow for installation of smoke detectors within three feet horizontally of a bathroom opening, if the bathroom contains a bathtub or shower. An exception is provided if this would interfere with one of the previous required locations.
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