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The boundary that a wall faces is the relevant boundary (Diagram 11.2). It may be one of the following.
a. The site boundary.
b. The centre line of a space where further development is unlikely, such as a road, railway, canal or river.
c. An assumed notional boundary between two buildings on the same site (Diagram 11.3) where either of the following conditions is met.
i. One or both of the buildings are in the "residential" or "assembly and recreation" purpose groups (purpose group 1, 2 or 5).
ii. The buildings will be operated/managed by different organisations.
To assist the fire service to identify each floor in a block of flats with a top storey more than 11m above ground level (see Diagram D6), floor identification signs and flat indicator signs should be provided.
Blocks of flats with a top storey more than 11m above ground level (see Diagram D6) should be fitted with a sprinkler system throughout the building in accordance with Appendix E.
NOTE: Sprinklers should be provided within the individual flats, they do not need to be provided in the common areas such as stairs, corridors or landings when these areas are fire sterile.
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In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity