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9.25.2.4.(4)
ApplicationIntent
OS2OH1+OS2OH1OP2OP3OS3OH4OS2OH1
ObjectiveOP3 Protection of Adjacent Buildings from Fire
Attribution
(c) [F81-OP3.1] Applies where the interior finish contributes to the required fire resistance of the wall.
Application
Application 1: 
Installation of blown-in insulation in wood-frame walls separating heated space from unheated space or the exterior, in new buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of:
  • inadequate fastening of or damage to the interior finish,
  • inadequate protection of the insulation, air barrier system or vapour barrier, which could lead to condensation, which could lead to deterioration of the assembly, or
  • where the interior finish contributes to the required bracing, inadequate performance of the interior finish, which could lead to an inability to resist expected lateral loads, which could lead to excessive racking.
This is to limit the probability of compromised fire resistance of the wall, which could lead to insufficient fire resistance, which could lead to the spread of fire from the building to an adjacent building during the time required for emergency responders to perform their duties.
This is to limit the probability of damage to the adjacent building.
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