Approved Doc B – Fire Safety

The regulation + guidance affecting fire doors is contained in Approved Document B, Volumes 1 + 2. These specifically cover fire safety guidance for buildings in which fire doors play a critical role in fire safety.


Volume 1: Dwellinghouses      Volume 2: Buildings other than dwellinghouses 

Dwellinghouses (Doc B - Volume 1) 

Fire doors are required: 

  • In a cavity barrier (wall) where applicable
  • Above two levels, every door leading to the stairwell (at all levels). Where the door leads to a habitable room (i.e. not a bathroom or w/c)
  • When a property has a loft conversion
  • Between house and integral garage
  • Between the business and residential elements in a mixed-use building

Note that this list is not exhaustive and other locations may require fire doors depending on the layout, use and fire plan of the individual dwelling.


Non-domestic buildings (Doc B - VOLUME 2)

Fire doors are required in many different non-domestic buildings such as:

  • Schools 
  • Hospitals
  • Flats
  • House of Multiple Occupancy (HMO)
  • Nursing Homes
  • Hotels
  • Public Buildings
  • Offices
  • Warehouses
  • Entertainment Venues
  • Factories and more…

The location and rating of fire doors will be based on the Fire Risk Assessment (FRA), design and layout of the particular building with consideration to the user’s particular needs. The FRA must always be carried out by a competent, trained and qualified individual. 


Flats (Doc B - VOLUME 2)

Fire doors are required:

  • Front door of individual flats
  • Within individual flats to stop the spread of fire between rooms
  • Other locations depending on the layout, use, fire risk assessment and fire plan of the individual building


Fire Rating of Doors in the Building Regulations 

In the guidance documents a door which provides at least 30 minutes fire protection is designated FD30. A door which provides the same protection and also protects against cold smoke is designated FD30S. Similarly, a door which provides at least 60 minutes fire protection is designated FD60, or FD60S if the door also provides protection against cold smoke.

30 Minutes FD30 FD30S 
60 Minutes FD60 FD60S 
90 Minutes FD90 FD90S 
120 Minutes FD120 FD120S 

The Regulatory Reform (Fire Safety) Order 2005 also gives requirements for fire and smoke performance in certain buildings. 


The Solution 

The Lorient solution is to fit a sealing system which, properly located and secured, prevents the passage of cold smoke, fire + hot smoke.