BS 476-22 Fire tests on building materials and structures — Part 22: Methods for determination ofthe fire resistance of non-loadbearing elements of construction

1 Scope
This Part of BS 476 describes procedures for determining the fire resistance of non-loadbearing elements of building construction when subjected to the heating and pressure conditions specified in BS 476-20. This Part is applicable to vertical partitions, to fully insulated, partially insulated and uninsulated vertical doorsets and shutter assemblies (except fire dampers incorporated in ducts), to ceiling membranes, and to glazed elements.

The methods described are appropriate to normal combinations of these elements.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.

2 Definitions
For the purposes of this Part of BS 476, the definitions given in BS 476-20 and BS 4422 apply, together with the following:

2.1
ceiling membrane
a non-loadbearing element of a building construction designed to provide horizontal fire separation as distinct from protection to any floor or roof above

2.2
doorset
an assembly (including any frame or guide) for the closing of permanent openings in separating elements. For the purposes of this standard, the term doorset includes shutter assemblies but excludes fire dampers for incorporation into ducts 2.3 partition a non-loadbearing element of a building construction designed to provide vertical fire separation when exposed to fire from one side

NOTE The partition may incorporate either glazing or doors.