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3.1.5.12.(2)
ApplicationIntent
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Application
Application 1: 
Thermal barrier protection of foamed plastic insulation from adjacent space in a building, other than adjacent concealed spaces within wall assemblies, and where the insulation has a flame-spread rating not more than 25 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A that are required to be of noncombustible construction, and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be of noncombustible construction, as stated in Sentence 9.10.6.1.(1).
Application 2: 
This also applies to the protection of combustible insulation in exterior walls, and within interior walls, ceilings and roof assemblies, as stated in Sentence 3.1.5.12.(3) and Sentence 3.1.5.12.(4) [see Record 01 of each Sentence].
Exceptions: 
except as stated in Sentence 3.1.5.12.(6), which applies to thermosetting foamed plastic insulation having a flame-spread rating not more than 500 that forms part of a factory-assembled exterior wall panel that does not incorporate an air space.
Application 3: 
This also applies to:
  • ceiling spaces used as return air plenums in buildings described in Sentence 1.3.3.2.(1) of Division A regardless of type of construction, as stated in Sentence 3.6.5.4.(6), and in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], as stated in Sentence 9.33.6.4.(6),
  • vertical service spaces in buildings described in Sentence 1.3.3.2.(1) of Division A regardless of type of construction, as stated in Sentence 3.6.3.2.(1), and
  • chutes and shafts in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] as stated in Sentence 9.10.1.2.(7), except when they are entirely contained within a dwelling unit.
Application 4: 
This also applies to:
  • buildings described in Sentence 1.3.3.2.(1) of Division A that are permitted to be of combustible construction, as stated in Clause 3.1.4.2.(1)(c), and
  • buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are permitted to be of combustible construction, as stated in Clause 9.10.17.10.(1)(c).
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Intent
Intent 1: 
To exempt certain combustible materials from the application of Sentence 3.1.5.1.(1) if certain conditions are met, on the basis that the materials are deemed to insignificantly contribute to fire growth and spread.
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