Main changes made by the 2020 amendments
The changes focus on the following fire safety provisions in blocks of flats:
a. Sprinklers: A reduction in the trigger height from 30m to 11m.
b. Wayfinding signage for the fire service: A new recommendation for floor identification and flat indication signage within blocks of flats with storeys over 11m.
In addition a typographical error is corrected in both volumes.
Purpose group number 2 is now included in reference to ‘residential’ buildings in the guidance on boundaries.
The changes are set out in the May 2020 AD B amendments.
Main changes made by the 2022 amendments
The changes focus on the following fire safety provisions:
a. Ban of combustible materials in and on the external walls of buildings: Consequential amendments following the laying of the Building (Amendment) (England) Regulations 2022.
Updated provisions in Section 10 for residential buildings (purpose groups 1 and 2) with a storey 11m or more in height.
b. Secure information boxes: A new recommendation for secure information boxes in blocks of flats with storeys over 11m.
c. Evacuation alert systems: A new recommendation for evacuation alert systems in blocks of flats with storeys over 18m.
d. Clarifications and corrections: Clarification of further diagrams, further text clarifications and corrections.
The changes are set out in the June 2022 AD B amendment booklet and November 2022 correction notice.
