ORIENTED STRAND BOARD FIRE PERFORMANCE

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TB11724Summary It has been determined by testing that wood structural panels, OSB and construction plywood, have equiva-lent fire PERFORMANCE , therefore OSB can replace ply-wood in published wall and floor 1 AssemblyRating Gypsum ThicknessOSB ThicknessPartition Wall (a)14 min. N/A 19/32 , 5/8 15 mmExterior Wall (b)45 min. 1/2 , 7/16 mmExterior Wall (c)1 hour5/8 Wall (d)1 hour5/8 (e) 1 hour 5/8 All Cavities insulated with 3-1/2 Mineral Wool in- sulation. Studs are 16 on center and OSB is inst- alled parallel to Assembly (a) has OSB on both Assemblies (b) & (c) have fire on the Assembly (d) has OSB on both sides of studs and covered by gypsum BOARD on both sides under All gypsum BOARD is Type X or National Building Code of Canada (NBCC) and the Model Codes specify that structural sheathing panels installed in combustible construction have a fire resistance rating depending on the building occu-pancy and the spatial separation between ProcedureUsing the Warnock Hersey fire Laboratory (now part of Intertek G)

24 TB117 Summary It has been determined by testing that wood structural panels, OSB and construction plywood, have equiva- lent fire performance, therefore OSB can …

  Performance, Fire, Fire performance