Technical Booklet E Fire Safety·Page 104·4.17
Provision of compartment walls and compartment floors - all purpose groups
Compartment walls must be constructed where walls are common to two or more buildings or divide a building into separated parts, and where parts of a building are in different purpose groups.
In buildings of all purpose groups –
(a) a compartment wall should be constructed where a wall –
(i) is common to two or more buildings; or
(ii) is provided to divide a building into separated parts; and
(b) a compartment wall or a compartment floor, as appropriate should be constructed to separate parts of a building which are in different purpose groups of Appendix A.
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