In response I was told that in most of the
new installations there is an appreciable gap at the floor level and this tends
to be greater than was previously obvious at locations which had a more
traditional timber unit in place. Of the 1200 properties across the city that
have been fitted with security doors only between 20 to 30 have had an existing
door completely replaced with a steel equivalent. The vast majority of installations
take place on blocks with no existing door (about 75%) or else on existing
doors that are easily adapted to accommodate the locking devices.
Apparently on occasion a bespoke draught
brush has been provided if local conditions allow it without hindering the
opening and closing of the door.
I recently received an update advising me
that the Housing Investment Unit Project Team has now discussed the use of
draught excluders and the outcome is that from now on these will be fitted as
standard to all new rear steel doors where building design allows.