resistance-to-the-incipient---spread-of-fire
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Resistance to the incipient spread of fire
NCC
in relation to a ceiling membrane, means the ability of the membrane to
insulate the space between the ceiling and roof, or ceiling and floor above, so
as to limit the temperature rise of materials in this space to a level which
will not permit the rapid and general spread of fire throughout the
space.
Explanatory information:
Resistance to the incipient spread of fire refers to the ability of a ceiling to prevent the spread of fire and thermally insulate the space between the ceiling and the roof or floor above. " Resistance to the incipient spread of fire " is superior to "fire-resistance" because it requires a higher standard of heat insulation.
The definition is used in Volume Two for separating floors/ceilings for a Class 1a dwelling located above a non-appurtenant private garage .