Copyright Materials. Fire-Rated Cementitious Coated OSB in Wall and Roof Sheathing Applications

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1 WoodWorks National Sponsors Fire-Rated Cementitious Coated OSB in Wall and Roof Sheathing Applications LP Building Products 2010 Slide 1 of 45 Fire-Rated Cementitious Coated OSB in Wall and Roof Sheathing Applications LP Building Products 414 Union Street, Suite 200 Nashville, TN Course Number: LPFRS1 Learning Units: 1.00 LP Building Products is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-aia members are available upon request. Copyright Materials This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited. The Wood Products Council 2010 This program is registered with AIA/CES for continuing professional registration. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material or construction or any method or manner of handling, using, distributing or dealing in any material or product. Questions related to specific materials, methods and services should be directed to the program instructor. This presentation is protected by US and International copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited. Slide 3 of 45

2 Learning Objectives Fire Facts OSB Sheathing *Fire-rated cementitious coated OSB sheathing = FRCC OSB sheathing Describe the components and manufacture of FRCC OSB Discuss handling and installation considerations Describe how FRCC OSB meets code requirements Illustrate common construction applications relevant to FRCC OSB A structural fire occurs, on average, every 61 seconds (NFPA,2008) When fire strikes, building evacuation is highest priority Fire-resistant construction is intended to preserve structural integrity long enough to allow evacuation and prevent collapse of key load-bearing elements FRCC OSB sheathing can be a cost-effective means of meeting fire-related related and structural code requirements. Slide 5 of 45 Slide 6 of 45 What Is OSB Sheathing? OSB Sheathing What is FRCC OSB Sheathing? FRCC OSB Sheathing Oriented strand board (OSB) is: Uniform, strong, and durable Code-compliant structural panel Made of wood strands blended with water-resistant adhesives and wax OSB with a tightly-bonded layer of fiberglass- reinforced, non-combustible magnesium oxide cement Resists spread of flames and transfer of heat through the panel Carries full load/span ratings (no deduction) Formulated for resilience to nailing and impact Exposure 1 classification designed to withstand moisture during normal construction delays Slide 7 of 45 Slide 8 of 45

3 What Is FRCC OSB Sheathing? OSB Sheathing Panel Dimensions & Panel Weight FRCC OSB Sheathing Installs with standard fasteners No special edge treatments required Handling and safety same as standard structural panels Cuts with standard blades (carbide is recommended) FRCC OSB panels are made in standard d OSB performance categories, including Struct 1 grade (4 x 8, 4 x 9, 4 x 10 ) Cementitious i coating itself adds approx. 0.7 lbs sq/ft 4 x 8, 15/32 Category FRCC OSB panel weighs approx. 66 lbs Slide 9 of 45 Slide 10 of 45 Structural Performance FRCC OSB Sheathing Code Compliance Fire-Rated Construction Fiberglass-reinforcement increases strength, shear capacity, bending stiffness and impact resistance Span and strength ratings are verified by P.E.I. Inc., an independent, ISO-certified testing laboratory Load, span, and design shear values are the same as those of other structural panels in the same thickness category (same tables apply). Exposure 1 Classification means it is designed to withstand moisture during normal construction delays Slide 11 of 45 IBC, IRC, and local codes specify required hourly fire ratings and types of products, referring to standard d tests that measure flame spread or fire resistance of products or assemblies. Agencies (ICC-ES) consider performance requirements of products and establish test criteria. Evaluation Reports (ESRs, or code reports ) are issued based on product performance versus the test criteria. The relevant acceptance criteria and ESR for FRCC OSB are AC264 and ESR-1365, respectively. In addition, rated assemblies are listed by UL, Intertek Slide 12 of 45

4 Fire Ratings FRCC OSB Sheathing Flame Spread Rating Fire-Rated Construction Flame spread rating ASTM E-84 Tunnel Test (aka UL723 test) 0-25 = Class A, or = Class B, or 2 IBC states that FRT wood must meet Class A requirements in the standard 10-minute flame spread test, and also exhibit flame spread progression of 10.5 feet or less in the extended (30-minute) E84 test. FRCC OSB sheathing has a Class A flame spread rating. It achieves a flame spread index of 0 to 10 in both the standard, 10-minute test and the 30-minute test = Class C, or 3 Slide 13 of 45 Slide 14 of 45 Burn-Through Resistance Fire-Rated Construction Construction Types (per IBC Table 503) Fire-Rated Construction Period of time that a material or assembly can resist degradation due to fire and support a given load ASTM E-119 test subjects walls and floor/ceiling assemblies to fire conditions while under load. Challenging test process: Temperatures on the exposed side of an assembly reach over 1700F Several 1-hour and 2-hour rated wall assemblies utilizing FRCC OSB have passed this test, making it a code-compliant component of those assemblies. Type of Construction FRTW or FRCC OSB Type I (fire resistive) Mainly non-structural* Type II (non-combustible) Roof deck, non-struct* Type III (ordinary) Throughout* Type IV (heavy timber) Type V (wood frame) Throughout *FRCC OSB must be treated on both faces of panel Slide 15 of 45 Slide 16 of 45

5 Construction Type V (A and B) Fire-Rated Construction Vertical Continuity of Fire Walls TYPE V - Wood-frame construction Interior framing and exterior walls may be wood. Typical construction method for single-family homes and common in construction up to 4 stories. Traditionally built with 2x4 or 2x6 framing Protected "A" means that structural members of a building or structure have additional fire rated coating or cover which extends the fire resistance rating of structural members to at least 1h hour. The most common application for FRCC OSB Frequently utilized in town homes, condominiums, apartments. Un-protected "B" means that structural members of a building or structure have no additional fire rated coating or cover. Slide 17 of 45 IBC Vertical Continuity of Firewalls Fire-Rated Construction Multi-Family Roof Deck Construction FRCC OSB Sheathing Applications & Installation IBC Fire walls shall extend from the foundation to a termination ti point at least 30 inches (762 mm) above both adjacent roofs. Exception: In buildings of Type III, IV and V construction, walls shall be permitted to terminate at the underside of combustible roof sheathing or decks provided: 4.3. The roof sheathing or deck is constructed of fireretardant-treated wood for a distance of 4 feet (1220 mm) on both sides of the wall or the roof is protected with 5/8 inch (15.9 mm) Type X gypsum board directly beneath the underside of ftheroof sheathing or deck, supported dbyaminimum i of f2- inch (51 mm) nominal ledgers attached to the sides of the roof framing members for a minimum distance of 4 feet (1220 mm) on both sides of the fire wall. Fire wall with the adjacent trusses and Class A-rated roof deck Gypsum underlayment or FRT panels 4 4 Slide 19 of 45 Slide 20 of 45

6 Vertical Continuity of Fire Walls in Roof Decks Condominum Project, California In lieu of parapets or gypsum, roof decking must meet flame spread criteria of IBC Code assumes that the fire threat is from the interior of the structure. FRCC OSB, treated on one side, is code-compliant compliant in this application, with the fire-resistive layer facing the interior. [See ESR-1365, Section 4.2 (a)]. Meets vertical continuity requirements with a single panel solution with full load and span ratings and an Exposure 1 classification. Available in 7/16 (24/16) thickness category Slide 21 of 45 Vertical Continuity of Firewalls Basic Principles Exterior Rated Walls Basic assumption is that fires begin at the interior and rated wall assemblies are not required for the exterior Interior Fire Protection on Inside of Building Exterior

7 Basic Principles Exterior Rated Walls When proximity to other buildings decreases, fire protection is needed on the building exterior Lot Line < 30 Exterior Fire Protection on Exterior When < 30 Interior Exterior Rated Assemblies Table 602 establishes requirements For structures separated by they are typically 0 or 1 hour rated TABLE 602 FIRE RESISTANCE RATING REQUIREMENTS FOR EXTERIOR WALLS BASED ON FIRE SEPARATION DISTANCEa, e FIRE SEPARATION TYPE OF OCCUPANCY GROUP OCCUPANCY GROUP F OCCUPANCY GROUP A, B, DISTANCE = X (feet) CONSTRUCTION H 1, M, S 1 E, F 2, I, R, S 2, U b X < 5 c All < X <10 IA Others < X < 30 IA, IB d IIB, VB Others d X>30 X > 30 All For SI: 1 foot = mm. a. Load bearing exterior walls shall also comply with the fire resistance rating requirements of Table 601. b. For special requirements for Group U occupancies see Section c. See Section for party walls. d. Open parking garages complying with Section 406 shall not be required to have a fire parking garages shall not required to have a fire resistance rating. rating. e. The fire resistance rating of an exterior wall is determined based upon the fire separation distance of the exterior wall and the story in which the wall is located. LPB/WA Hr Wall Assembly w/ FRCC OSB One-hour wall along property line 1-hour exterior wall Intertek listing 2 x 6 framing 1684 lbs per stud Mineral wool insulation Wood and fiber cement claddings 2 x 4, 1-hour exterior walls under development Slide 27 of 45

8 One-Hour Rated Walls, San Diego, CA Advantages in 1-hour Exterior Walls Compared to more traditional exterior wall assemblies, use of assemblies such as LPB/WA may offer: Labor savings Reduced dead load Reduced wall thickness Better substrate for fastening of exterior cladding 2-Hr Party Wall Assembly w/ FRCC OSB BXUV_U350 2-Hr Party Wall Assembly w/ FRCC OSB UL listing BXUV U350 2-hour party wall for multi-family il construction ti Load-bearing, wood studs 16 o.c. Two configurations: A FRCC OSB and Type X GWB on living space side of wall B FRCC OSB on property line side of studs, and resilient channel behind Type X GWB STC rating = 61 Fire-rated penetrations required Cost-effective alternative to area separation walls using shaft liner/h studs in some situations. NOT rated as two, separate 1-hour walls, which limits its use. BXUV U350 2-Hr Party Wall Assembly w/ FRCC OSB Slide 31 of 45 Slide 32 of 45

9 Construction Type III Fire-Rated Construction Exterior Walls Type IIIA 2 Hour TYPE IIIA Ordinary or Brick & Joist Floors, interior structural frame, and roof are typically wood or other combustible material, often in 1 or 2- hour rated assemblies. Et Exterior walls require non-combustible materials. As an exception, IBC Section permits use of FRT wood complying with IBC Sec within load-bearing exterior wall assemblies of a 2-hour rating or less. Exterior walls carry a 2-hour rating for bearing and 1- hour for nonbearing, for exposure from the inside. TABLE 601 FIRE RESISTANCE RATING REQUIREMENTS FOR BUILDING ELEMENTS (hours) TYPE I TYPE II TYPE III TYPE IV TYPE V A B A e B A e B HT A e B BUILDING ELEMENT Bearing walls Exterior g Rating from the exterior side depends on fire separation distance (See IBC Section 705.5). Slide 33 of 45 2-Hr Exterior Wall Assemblies w/ FRCC OSB Code-Compliance in Type III Exterior Walls 2-hour (interior burn) wall assembly for multi-family construction BXUV.U349 U349 permits R13 fiberglass insulation BXUV.W408 also carries 1- hr exterior burn rating w/ mineral wool insulation Accepted in Type IIIA with cementitious coating on both sides of panels Exterior Cladding Vented Cavity Weather-Resistive Barrier FRCC OSB Fill Cavity with Fire Safety Batts ½ x3 P.T. Plywood furring, align with studs and FCS panel joint locations provide blocking at joints without framing Wood Framing (2) Layers 5/8 Type X Gypsum Vapor Barrier Paint Neither FRTW nor FRCC OSB are considered noncombustible materials IBC Section defines FRT wood and panels: Flame Spread of 25 or less in ASTM E84/UL723 Flame progression less than 10.5 ft in extended test Structural panels shall be tested on both sides, not edges Wood shall be treated by pressure impregnation or by other means at the time of manufacture FRCC OSB satisfies the above criteria when treated on both faces of the panel. Slide 35 of 35

10 Type IIIA Walls: College Park, MD (Student Housing) Type IIIA, Fairfax, VA Slide 37 of 45 Type IIIA, Issaquah, Washington Why Consider FRCC OSB in Type III? Compared to more traditional exterior wall assemblies, use of U349 and W408 may offer: Labor savings Reduced dead load Reduced wall thickness Better substrate for fastening of exterior cladding

11 FRCC OSB in Type I and II Buildings Commercial Roof Decks FRCC OSB Sheathing Applications & Installation IBC Section describes areas where combustible materials are allowed. FRT wood is permitted in: 25.1: Nonbearing partition walls rated 2 hours or less 25.2: 2 Nonbearing exterior walls where no fire rating is required. 25.3: Roof construction, including girders, trusses, framing, and decking (Except in most IA buildings above 2 stories) Section 4.2 (b) of ESR 1365 states code compliance of FRCC OSB in these applications with treatment on both sides of panel. FRCC OSB sheathing is used in Class A- and Class C- rated low-slopel commercial roof deck assemblies, under single-ply membranes It exceeds the 15-minute thermal barrier requirement for foam core plastics FRCC OSB EPDM Water-based adhesive Slide 42 of 45 SIPs FRCC OSB Sheathing Applications & Installation Wildfire Zones FRCC OSB Sheathing Applications & Installation Depending on the level of fire protection required, SIPs can be manufactured with FRCC OSB sheathing on the interior face, exterior face, or both faces of the panel FRCC OSB Sheathing EPS core OSB Sheathing on exterior wall splines The California State Fire Marshal s Office recognizes FRCC OSB sheathing as a component of wall assemblies meeting the requirements of the California 12-7a-1 and 12-7a-3 fire tests for exterior walls and soffits in high fire hazard areas. Successfully tested assemblies include untreated cedar shingles and lap siding and wood-strand-based composite siding as exterior cladding, providing an alternative to fiber cement and stucco in the WUI zones. Slide 43 of 45 Slide 44 of 45

12 Plenums FRCC OSB Sheathing Applications & Installation How Is FRCC OSB Sheathing Green? Sustainability & Green Building FRCC OSB satisfies the IMC and UMC requirements for plenum construction, ti with the treatedt side facing the interior of the plenum. Under the IRC, FRCC OSB satisfies the requirements for return air ducts or plenums not exposed to condensation. Use in ducts and plenums is described in ICC report PMG As a structural/fire-resistant panel it can reduce material costs and overall material usage. Made of engineered wood, a renewable resource Contains no harmful chemicals, requires no special handling, and is accepted by most landfills Can help earn certification points in green building programs Slide 45 of 45 Slide 46 of 45 Course Summary Summary and Resources Resources Summary and Resources FRCC sheathing is OSB with a layer of non-combustible, fiberglass-reinforced i f magnesium oxide, tightly bonded d to one or both faces Install with standard tools, methods, and safety procedures. Class A Flame Spread Rating Full load/span ratings and shear capacity Primary uses: component of fire-resistance-rated resistance rated wall assemblies roof decking for vertical continuity of fire walls component of fire-classified roof covering assemblies applications requiring Class A Flame Spread or thermal barrier LP Building Products, Fire-Rated OSB Sheathing, U.S. Green Building Council, ASTM International, International Code Council (ICC), Slide 47 of 35 Slide 48 of 45

13 Questions? Thank You for Attending This concludes the American Institute of Architects Continuing i Education Systems Program p LP Building Products 2010 Slide 49 of 45