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Section 5

BS 5588-7:1997

Is atrium 18 m or less in height ?

No

Is atrium 30 m or less in height?

Yes

Yes

Stairs should be sized for simultaneous evacuation

Stairs should be sized for simultaneous evacuation

Provide L2 AFD within atrium and associated areas including voice alarm throughout building

Provide L2 AFD within atrium and associated areas including voice alarm throughout building

Is atrium fully enclosed by 30 min fire-resisting construction?

Is atrium fully enclosed by 30 min fire-resisting construction?

Yes Enclose atrium at each storey with smoke retarding construction

Provide smoke clearance system within the atrium

Controlled fire load within atrium base

No Enclose atrium at each storey with smoke retarding construction

Provide temperature control system within atrium

Controlled fire load within atrium base

Yes Enclose atrium at each storey with smoke retarding construction

Provide smoke clearance system within the atrium

Controlled fire load within atrium base

No

Go to figure 4c

No Enclose atrium from all storeys more than 18m in height by 30 min fire-resisting and smoke retarding construction

Enclose atrium from all storeys 18m or less in height with smoke retarding construction

Provide temperature control system within atrium

Controlled fire load within atrium base

See exemplar 13 Provide sprinkler system in associated floor area(s) See exemplar 14

Provide sprinkler system in associated floor area(s)

Provide sprinkler system in associated floor area(s)

No exemplar given

No exemplar given

Figure 4b — Occupancy category B: occupants who are awake but may be unfamiliar with the building — Atrium over 30 m in height, enclosed

30

© BSI 8 December 2004

Bs 5588 71997 fire precautions in the design, construction a  
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