Robert steel

Many thanks for this info, is there any documented regulation that I can read up on reference this??

Hi A residential block of flats which has connected halls and is ground to sixth floor. If riser cupboards on a communal hall/ exit routes has large Breaches on the floor and ceiling from grd to sixth, but has FD30s fitted also an AOV within the hall ways and a fire dectection system installed, is it recommended that all breaches are suitable sealed up or left as it is???