The latest major change to loft conversion fire regulations was made in 2007. The biggest change at this time concerns the replacement of interior doors with fire doors. Prior to this change you could retain old doors as long as they were self closing, but authorities realised these tend to be wedged open so it is no longer sufficient.
New fire safety rules disclose that any doors facing the designated escape route from the loft conversion must be fire resistant to 20 minutes as standard. Contrary to what many people believe, fire doors must be installed even if there is an escape window fitted in the roof.
It’s recommended that self closers are fitted to all fire doors since a wedged open fire door is completely useless. An FD20 grade door is sufficient though an FD30 adds more and is generally more recommended.
Intumescent strips are fitted into the door itself and the frame so that if fires occurs they swell and seal off the area that is generating smoke.