TECHNICAL GUIDE STRUCTURAL PERFORMANCE A N D F I R E R E S I S TA N C E I N T H E S A M E PA N E L
L P ® F L A M E B L O C K ® F I R E - R AT E D O S B S H E AT H I N G : BUILD ON OUR STRENGTH, CO U N T O N O U R F I R E R E S I S TA N C E TABLE OF CONTENTS Product Description Product Specifications 2 3–4 Applications & Assemblies 5–12 Product Installation Instructions 13 Warranty 14 LP & Sustainability 15 LP® FLAMEBLOCK® FIRERATED OSB SHEATHING FEATURES A PROPRIETARY NON-COMBUSTIBLE, FIBERGLASS-REINFORCED PYROTITE® TREATMENT.
SIZE/LENGTH LP FlameBlock sheathing is available in standard thickness and performance categories, including Struct-1 performance grade, and in nominal dimensions of 4´ x 8´, 4´ x 9´, and 4´ x 10´.
WEATHER RESISTANCE With LP FlameBlock sheathing’s water-resistant adhesives and durable Pyrotite treatment, each panel carries an Exposure 1 classification, so it can withstand exposure to moisture during normal construction delays. As with similarly classified panels, installation of building wrap is required for weather protection during construction. STABILITY LP FlameBlock sheathing won’t cup, warp, split or delaminate. You can count on consistent quality, without core voids and knots.
STRUCTURAL PERFORMANCE The fiberglass reinforcement within the Pyrotite treatment of LP FlameBlock sheathing increases the shear capacity, bending performance, and impact resistance of the underlying OSB substrate. Structural design properties are identical to those of standard, PS2-certified wood structural panels in the same thickness category, with no deductions as a result of the treatment. (See Figure 1 and Figure 2.) Structural performance and compliance with other PS2 standards are certified by P.E.
A P P L I C AT I O N S A N D A S S E M B L I E S ROOF DECKING TO SATISFY VERTICAL CONTINUITY REQUIREMENTS FOR FIRE WALLS REFERENCE DOCUMENTS: 2009 AND 2012 IBC SECTION 706.6 AND ESR 1365, SECTION 4.2A Examples: Roof decks over interior or exterior fire walls in single family, multifamily and townhomes. Framing: A s required by the pertinent fire wall and roof assemblies and in accordance with local building code.
REFERENCE DESIGN: INTERTEK L PB/WPPS 60-01 BTC/WA 60-01 Click here for online listing. Fire Rating: 1 hour from both sides BEARING WALL - MAXIMUM LOADING OF 2,145 LBS. PER STUD Examples: Single and multifamily buildings close to lot lines. Framing: Nominal 2˝ x 6˝ framing, spaced 16˝ o.c., with two top plates and one bottom plate. Mineral wool insulation, nominal 2.5 pcf and 51⁄2˝ thick, pressure fit in the cavities between studs.
A P P L I C AT I O N S A N D A S S E M B L I E S REFERENCE DESIGN: BXUV.U348/BXUVC.W323 Click here for online listing. Fire Rating: 1 hour from interior side only Finish Rating: 23 minutes BEARING WALL Examples: Multifamily/senior living and commercial Type V property where a fire rating from the exterior is not required. Framing: Nominal 2˝ x 4˝ framing, spaced 16˝ o.c. or 2˝ x 6˝ framing, spaced 24˝ o.c., with two top plates and one bottom plate. Faced or unfaced mineral fiber insulation, nominal 3.
REFERENCE DESIGN: BXUV.U349/BXUVC.W324 Click here for online listing. Fire Rating: 2 hours from interior side only Finish Rating: 55 minutes BEARING WALL Examples: Type III buildings (5 & 6 stories) mixed use/multifamily residential buildings with adequate fire separation distance. Framing: Nominal 2˝ x 4˝ framing, spaced 16˝ o.c. or 2˝ x 6˝ framing, spaced 24˝ o.c., with two top plates and one bottom plate, OR minimum No. 20 MSG corrosion-protected steel studs, minimum 31⁄2˝ deep. Maximum spacing 16˝ o.
A P P L I C AT I O N S A N D A S S E M B L I E S REFERENCE DESIGN: BXUV.W408 Click here for online listing. Fire Rating: 2 hours from interior side, 1 hour from exterior side Finish Rating: 50 minutes on interior face, 17 minutes on exterior face BEARING WALL Examples: Type III buildings (5 & 6 stories) mixed use/multifamily residential buildings. Framing: N ominal 2˝ x 4˝ framing, spaced 16˝ o.c. or 2˝ x 6˝ framing, spaced 24˝ o.c., with two top plates and one bottom plate.
REFERENCE DESIGN: BXUV.U350/BXUVC.W325 Click here for online listing. Fire Rating: 2 hours from both sides Finish Rating: 23 minutes BEARING WALL STC RATINGS: CONFIGURATION A: 62 CONFIGURATION B: 62 Examples: W alls between living units, 2-hour chase 5/8˝ Type X GWB Wallboard Joints and Nailheads covered with tape and joint compound 3-1/2˝ 3.0 pcf Mineral Wool Insulation walls, or between living units and corridors/stairs.
A P P L I C AT I O N S A N D A S S E M B L I E S REFERENCE DOCUMENTS: CALIFORNIA WUI ZONE EXTERIOR WALL TEST PROTOCOL 12-7A-1 Click here for online listing. Cal-Fire/OSFM Listing Nos 8140-2027:0005 and 8140-2027:0006 Western Fire Center Test Report No. 10023.1 Examples: Single and multifamily homes in areas designated as high wildfire hazard. Exterior: Minimum 15/32 category LP FlameBlock with Pyrotite treatment facing the exterior, fastened to studs with minimum 17⁄8˝ 6d nails, spaced 6˝ o.c.
REFERENCE DOCUMENTS: CALIFORNIA WUI ZONE TEST PROTOCOL 12-7A-3 Click here for online listing. Cal-Fire/OSFM Listing No. 8160-2027:0007 Western Fire Center Test Report No. 10085 Examples: Closed soffit in single and multifamily homes in areas designated as high wildfire hazard. Exterior: Minimum 7/16 category LP FlameBlock with Pyrotite treatment facing the exterior, fastened to supports with minimum 17⁄8˝ 6d nails, spaced 6˝ o.c. on perimeter and 12˝ in the field.
I N S TA L L AT I O N I N S T R U C T I O N S GENERAL REQUIREMENTS • Comply with local safety regulations when installing roof, wall, or subfloor sheathing. • Comply with the following manufacturer’s instructions and with APA’s Engineered Wood Construction Guide Form E30U (September 2007) or the current equivalent. STORAGE AND HANDLING • Store panels in clean, dry areas off the ground. If possible, store indoors.
I T ’ S M O R E T H A N O U R P R O D U C T S . I T ’ S T H E W AY W E D O B U S I N E S S . At LP Building Products, we’re proud to offer integrated building solutions that work together to save you time and money. And proud that our products offer so many benefits. But something else sets us apart: the way we do business. We believe that “sustainability” means acting in a way that protects the environment, embraces social responsibilities, and builds economic prosperity today and for future generations.
LP® FlameBlock® Fire-Rated OSB Sheathing helps you meet fire codes while reducing dead load and wall thickness versus common alternatives. It offers higher design values than FRT plywood at the same thickness and provides a better substrate for securely fastening exterior facing. Choose LP FlameBlock sheathing for your next project.
