Fire Performance Requirements of Non-Load-Bearing Wood-Frame In-Fill Walls in Concrete/Steel Hybrid Buildings. Part 2 - Review of the National Building Code of Canada

https://research.thinkwood.com/en/permalink/catalogue2622
Year of Publication
2013
Topic
Fire
Material
Light Frame (Lumber+Panels)
Application
Walls
Hybrid Building Systems
Author
Lu, Ling
Organization
FPInnovations
Year of Publication
2013
Country of Publication
Canada
Format
Report
Material
Light Frame (Lumber+Panels)
Application
Walls
Hybrid Building Systems
Topic
Fire
Keywords
Non-Loadbearing
Fire Resistance
Concrete
Steel
Building Code
Fire Performance
Exterior Wall
Sprinklers
Mid-Rise
Language
English
Research Status
Complete
Summary
This project evaluates the National Building Codes of Canada (NBCC) clauses relevant to fire performance and performance requirements of non-load-bearing wood-frame in-fill walls in concrete/steel hybrid buildings. Related clauses in NBCC are reviewed regarding the use of wood components and non-load bearing wall systems in non-combustible buildings. The highlights of this review are: § An exterior non-loadbearing wall assembly with combustible components is allowed in non-combustible construction if: a) Building height is not more than 3 storeys or has a sprinkler system throughout ; b) The interior surfaces of the wall assembly are protected by a thermal barrier ; and c) The wall assembly satisfied the testing criteria for CAN/ULC S134 ; § Combustible interior wall finishes, other than foamed plastics, are allowed in non-combustible construction if the thickness is not greater than 25 mm and their flame spread rating (FSR) is not more than 150 ; § Combustible insulation, other than foamed plastics, is allowed in non-combustible construction if the flame-spread rating not more than 25 ; § Combustible insulation with a FSR not less than 25 and not more than 500 is allowed in exterior and interior walls of non-combustible construction if the building is non-sprinklered and not more than 18 m or sprinklered and protected by a thermal barrier ; § There are no obstacles for using wood-frame in-fill wall systems for interior partition walls in hybrid buildings: a) For non-sprinklered buildings not greater than 3 storeys or a floor area not greater than 600 m2 ; b) For sprinklered buildings. § Non-combustible construction allows combustible elements in partition walls in the following instances: a) Solid lumber partitions located in a fire compartment area are permitted in a non-sprinklered floor area not greater than 600 m2 with restrictions ; b) Solid lumber partitions not less than 38 mm thick and partitions that contain wood framing are permitted with restrictions. § Combustible cladding can be used under the following circumstances: a) When a wall assembly with exposing building face is between 10 to 25% tested by CAN/ULC-S134 and complies with Article 3.1.5.5 ; b) When a wall assembly with exposing building face is between 25 to 50%, is sprinklered throughout, installed on a gypsum board sheathing, and has a FSR not more than 25 (with restrictions) ; c) When a wall assembly with exposing building face is between 50 to 100%, cladding can be combustible for group A, B, C, D, E, F. § When a building is required to be of non-combustible construction, combustible elements are limited to the requirements in Subsection 3.1.5 on non-combustible construction ; § When comparing the NBCC with the International Building Code (IBC), the IBC is more in favour of using FRT wood frame in-fill walls with one more storey.
Online Access
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