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9.10.17.10.(1)
OS1++
ObjectiveOS1 Fire Safety
Attribution
(a),(b),(c) [F01,F02,F05-OS1.5]
Application
Application 1: 
Protection of foamed plastics from adjacent spaces in a building, where the foamed plastics form part of wall or ceiling assemblies in combustible construction. This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except:
  • for the protection of foamed plastics from adjacent concealed spaces within attic or roof spaces, crawl spaces, and wall assemblies, and
  • as stated in Sentence 9.10.17.10.(2), which applies to thermosetting foamed plastic insulation having a flame-spread rating of not more than 200, used in factory-assembled doors in storage garages serving single dwelling units.
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Intent
Intent 1: 
To limit the probability that foamed plastic insulation will be exposed to a fire or subjected to high temperatures, which could lead to its ignition and contribution to the early growth and spread of fire, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
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