Questions · Fire detection
What does CTE DB-SI say and above what floor area does it require detection?
DB-SI is the Building Code document setting fire safety in non-industrial buildings, and it has six sections: internal spread, external spread, evacuation of occupants, protection installations, fire brigade intervention and fire resistance of the structure. The one that says whether detection is needed is SI 4, with its table 1.1, and the thresholds go by use and by built floor area.
In Hospital use, detection and alarm in all cases. In Public Residential —hotels and similar—, from 500 m². In Public Assembly, detection from 1,000 m², and an alarm system when occupancy exceeds 500 people, in which case it has to be able to issue voice messages over the public address system. In Administrative, Educational and Retail, alarm from 1,000 m² and detection from 2,000 m². In conventional car parks, detection from 500 m². In Residential Dwellings, only when the evacuation height exceeds 50 m.
They are worth reading for what they are: minimums designed so that people get out in time. Below the threshold you can install detection anyway, and in many places it pays to, because the threshold is not designed so that the building and what is inside it still exist the next day.
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