I am very puzzled by the changes in the new ADB in respect of the design of commen escape routes from flats.
Diagram 7 and 8 and the the text seem to indicate changes from the old version and from BS5588 part 1 1990.
Diagram 7a
In the past it was considered necessary to provide ventilation to the dead end portions of the common corridor and to the stair but not to the common lobby containing no risk. The new ADB dispenses with the ventilation to the dead end common corridors and instead requires the lobby to be ventilated. Can this be right?
Diagram 8 a b c
If I have an ideal design with no dead ends I am required to ventilate the whole of the common corridor. But if I move the staircases to create dead end conditions I then only have to ventilate the dead end portions of the corridors? And then if I stick a T junction with a further dead end there is no requirement for ventilation there either?
Please tell me I have missed something or that it is a mistake. Have just completed a major project design review with AOVs and OVs in compliance with 5588- are they in the wrong places now?
