9.18.7.1.(2)ATTRIBUTION:
Functional Statement:
F02
To limit the severity and effects of fire or explosions.
Objective:
OS1.2
APPLICATION:
Enclosing material in crawl spaces whose exterior
walls have less than 25% of their total area above exterior ground level open
to the outdoors, that are under 1-storey portions of dwelling units and are used as warm-air plenums, in buildings to which Part 9 applies [see Sentence
1.3.3.3.(1) of Division A for application
of Part 9].
INTENT:
To limit the probability that material having a high flame-spread
rating will be used in crawl spaces that are directly connected to living
space above (registers having no ducts), which could lead to the spread of
fire or smoke to other parts of the building within the time required for
evacuation, which could lead to harm to persons.