Fire Resistanse
1
TB117 24 Summary 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 assemblies. TABLE 1 Assembly Rating Gypsum Thickness OSB Thickness Partition Wall (a) 14 min. N/A 19/32”, 5/8” 15 mm Exterior Wall (b) 45 min. 1/2” 12.5mm 3/8”, 7/16” 11.0 mm Exterior Wall (c) 1 hour 5/8” 15.5mm 7/16” 11.0mm Exterior Wall (d) 1 hour 5/8” 15.5mm 7/16” 11.0mm Floor (e) 1 hour 5/8” 15.5mm 5/8” 15.5mm 1. All Cavities insulated with 3-1/2” Mineral Wool in- sulation. Studs are 16” on center and OSB is inst- alled parallel to studs. 2. Assembly (a) has OSB on both sides. 3. Assemblies (b) & (c) have fire on the inside. 4. Assembly (d) has OSB on both sides of studs and covered by gypsum board on both sides under siding. 5. All gypsum board is “Type X” or higher. Background The National Building Code of Canada (NBCC) and the U.S. 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 buildings. Test Procedure Using the Warnock Hersey Fire Laboratory (now part of Intertek Group plc), the Structural Board As- sociation conducted a series of fire performance comparison tests of OSB versus CSP and sanded ply- wood in various wall assemblies. These comparative tests showed that OSB had an equivalent or better fire performance for the same thickness than CSP ply- wood commonly used in Canada. In addition, full wall tests in accordance with ULC-S101 and ASTM-E119 Standard Methods of Fire Tests of Building Construc- tion and Materials were done on load bearing walls providing data for a 45-minute and 1 hour rating. APA – The Engineered Wood Association sponsored similar tests in accordance with ASTM-E119 on full wall systems with similar results. These tests have al- lowed Underwriters Laboratories Inc. to issue the wall Design No. U356 for fires originating inside a building and Design No. U344 for fires on either side of the wall. Recently, the North American consortium of fire re- searchers conducted tests on wall and floor systems using OSB and plywood at the National Research Council’s fire laboratory further substantiating the equivalent performance of the two structural panels. Additional Information Tables in Volume 2 of the 2005 NBCC list a number of acceptable assemblies incorporating OSB which pro- vide the fire resistance rating, typical sound transmis- sion class and typical impact insulation class. Conclusion The test results provide assurance to designers and builders that OSB structural panels can be inter- changed with structural plywood panels where fire endurance is required. TECHNICAL BULLETIN STRUCTURAL BOARD ASSOCIATION Representing the OSB Industry 25 Valleywood Drive, Unit 27, Markham, Ontario, Canada L3R 5L9 Tel: 905-475-1100 • Fax: 905-475-1101 • E-mail: [email protected] • website: http://www.osbguide.com ORIENTED STRAND BOARD FIRE PERFORMANCE
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Timber Fire Resistance
Transcript of Fire Resistanse
TB11724
Summary 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 assemblies.
TABLE 1 Assembly Rating Gypsum
ThicknessOSB
Thickness
Partition Wall (a) 14 min. N/A 19/32”, 5/8” 15 mm
Exterior Wall (b) 45 min. 1/2” 12.5mm
3/8”, 7/16” 11.0 mm
Exterior Wall (c) 1 hour 5/8” 15.5mm
7/16” 11.0mm
Exterior Wall (d) 1 hour 5/8” 15.5mm
7/16” 11.0mm
Floor (e) 1 hour 5/8” 15.5mm
5/8” 15.5mm
1. All Cavities insulated with 3-1/2” Mineral Wool in- sulation. Studs are 16” on center and OSB is inst- alled parallel to studs.2. Assembly (a) has OSB on both sides.3. Assemblies (b) & (c) have fire on the inside.4. Assembly (d) has OSB on both sides of studs and covered by gypsum board on both sides under siding.5. All gypsum board is “Type X” or higher.
BackgroundThe National Building Code of Canada (NBCC) and the U.S. 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 buildings.
Test ProcedureUsing the Warnock Hersey Fire Laboratory (now part of Intertek Group plc), the Structural Board As-sociation conducted a series of fire performance
comparison tests of OSB versus CSP and sanded ply-wood in various wall assemblies. These comparative tests showed that OSB had an equivalent or better fire performance for the same thickness than CSP ply-wood commonly used in Canada. In addition, full wall tests in accordance with ULC-S101 and ASTM-E119 Standard Methods of Fire Tests of Building Construc-tion and Materials were done on load bearing walls providing data for a 45-minute and 1 hour rating.
APA – The Engineered Wood Association sponsored similar tests in accordance with ASTM-E119 on full wall systems with similar results. These tests have al-lowed Underwriters Laboratories Inc. to issue the wall Design No. U356 for fires originating inside a building and Design No. U344 for fires on either side of the wall.
Recently, the North American consortium of fire re-searchers conducted tests on wall and floor systems using OSB and plywood at the National Research Council’s fire laboratory further substantiating the equivalent performance of the two structural panels.
Additional InformationTables in Volume 2 of the 2005 NBCC list a number of acceptable assemblies incorporating OSB which pro-vide the fire resistance rating, typical sound transmis-sion class and typical impact insulation class.
ConclusionThe test results provide assurance to designers and builders that OSB structural panels can be inter-changed with structural plywood panels where fire endurance is required.
TECHNICAL BULLETINSTRUCTURAL BOARD ASSOCIATION
Representing the OSB Industry
25 Valleywood Drive, Unit 27, Markham, Ontario, Canada L3R 5L9
Tel: 905-475-1100 • Fax: 905-475-1101 • E-mail: [email protected] • website: http://www.osbguide.com
ORIENTED STRAND BOARDFIRE PERFORMANCE
Contents
Surface Flammability of OSB (TB100) ..................................................................2 - 3
OSB Roof Sheathing Safety Study (TB101) ...............................................................4
Negligible or Non Existent Formaldehyde Emissions from OSB (TB102) ..............5
Oriented Strand Board and Waferboard (TB103) ......................................................6
Oriented Strand Board and the Canadian Building Codes (TB104) ....................7 - 8
Installation Instructions for OSB Products (TB105) ..................................................9
Roof Shingle Ridging (TB106) ...........................................................................10 - 11
Marking of OSB and Waferboard Panels (TB107) ............................................12 - 13
OSB in High Velocity Hurricane Zones (TB109) ...............................................14 - 15
Oriented Strand Board in Landfills (TB110) .............................................................16
Permeability of OSB Structural Panels (TB111) ......................................................17
Good Stucco Application Practices (TB112) .....................................................18 - 19
OSB Performance under High Humidity Conditions (TB113) ................................20
Binders and Waxes in OSB (TB114) .........................................................................21
Comparison of OSB and Construction Plywood (CDX) (TB116) .....................22 - 23
Oriented Strand Board Fire Performance (TB117) ..................................................24
TECHNICAL BULLETINBOOKLET
ISBN 1-896479-08-1
STRUCTURAL BOARD ASSOCIATIONRepresenting the OSB Industry
25 Valleywood Drive, Unit 27, Markham, Ontario, Canada L3R 5L9 Tel: 905-475-1100 • Fax: 905-475-1101 • E-mail: [email protected]
Website: http://www.osbguide.com
02M0107-TBB01
