9.1(d) Internal Planning of Flats and Maisonettes
Flats or maisonettes with an open plan arrangement and more than one floor should have a protected stairway and AWFSS fitted. This allows
escape to the shared external entrance.
9.3(b) Provision of inner rooms in flats not more than 4.5 m in height
Inner rooms are not suggested unless the use of an AWFSS is utilised throughout the entire building, along with a grade D LD1 fire detection and fire alarm system in accordance with BS 5839-6:2013.
9.4.2(a) Extended travel distances within an open-plan flat
Flats more than 4.5m above ground level that are entered on the same level can increase total travel distances to the entrances from 9m to20m with the use of an AWFSS throughout the entire building, along with an LD1 fire detection and fire alarm system in accordance with BS 5839-6:2013.
9.5.2(d) Maisonettes with floors greater than 4.5m
No requirement to provide a separate means of escape if the maisonette has a protected stairwell and a fully fitted AWFSS.
9.7 Open Plan Layouts
Open planned flats are permissible with a fully fitted AWFSS.