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“The Wood Products Council” is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES), Provider #G516.
Credit(s) earned on completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.
This course is registered with AIA CES for continuing professional education. 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 of construction or any method or manner ofhandling, using, distributing, or dealing in any material or product.___________________________________________
Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
Course DescriptionBuilding code requirements related to fire and life safety can be challenging for designers, particularly when it comes to proving fire resistance and maintaining structural performance. As such, understanding the applicability of available products can be helpful for designers. This presentation will provide an overview of fire-rated cementitious-coated oriented strand board (FRCC OSB) sheathing for wall and roof sheathing applications. Topics will include its structural and fire performance, available wall assemblies, and contribution to enhancing the sustainable built environment.
At the end of this program, participants will be able to:
1. Describe the physical attributes, fire performance and code-compliance of fire-rated cementitious-coated oriented strand board (FRCC OSB) sheathing.
2. Explain how FRCC OSB sheathing can be used to reduce labor costs and construction time.
3. Describe fire-rated wall assemblies relevant to FRCC OSB sheathing in the context of wood-frame building design and building code requirements.
4. Describe common construction applications for FRCC OSB sheathing in Types II, III and V construction.
• 7/16", 15/32", 19/32", and 23/32“OSB performance categories in 4' x 8', 4' x 9' and 4' x 10' lengths
• Struct-1 grade is available
• Coating adds approximately 0.6 lbsper square foot to a board• panel treated on one side = 66lbs• panel treated on both sides = 85lbs• 4' x 8' x 5/8" gypsum board (80 lbs) plus a 4' x 8', 15/32 wood
• ASTM E119 test (Standard Test Methods for Fire Tests of Building Construction and Material) is used to determine fire resistance ratings for wall and floor/ceiling assemblies.
Type of Construction FRTW or FRCC OSB! Type I (fire-resistive) Mainly non-structural*! Type II (non-combustible) Roof deck, non-structural*! Type III (ordinary) Throughout*! Type IV (heavy timber)! Type V (wood frame) Throughout
• FRCC OSB, treated on one side, is code-compliant and meets vertical continuity requirements with a single panel solution, with full load/span ratings and an Exposure 1 Classification
Exterior Rated Walls in the IBC705.5 Fire Resistance Ratings: Exterior walls shall be fire-resistance rated in accordance with Tables 601 and 602 and this section. The required fire-resistance rating of exterior walls with a fire separation distance of greater than 10 feet (3048 mm) shall be rated for exposure to fire from the inside. The required fire-resistance rating of exterior walls with a fire separation distance of less than or equal to 10 feet (3048 mm) shall be rated for exposure to fire from both sides.
• Traditional assembly: 2 layers of Type X GWB on the interior, wood framing , a shear panel layer if needed, then 1 or 2 layers of exterior GWB (depending on FSD) and a non-combustible exterior wall covering
TYPE IVA B Ae B Ae B HT Ae B
Bearing walls Exteriorg 3 2 1 0 2 2 2 1 0
BUILDING ELEMENT
FIRE-RESISTANCE RATING REQUIREMENTS FOR BUILDING ELEMENTS (hours)TABLE 601
• Code Compliance of FRCC OSB in bearing and non-bearing exterior walls of Type III buildings, in accordance with IBC Section 602.3, is described in ESR-1365
2-hour rated wall assembly with FRCC OSB in Type III construction(Student housing, College Park, MD)
Revisions to 2015 IRC Impact Town Home Partition Walls
• The requirement for separate, 1-hour-rated, structurally-independent walls in R302.1 have been removed, in favor of the common wall provisions of R302.2.
• Wall must be rated from both sides, for 1 hour with sprinkler system, 2 hours without sprinklers
• No plumbing, mechanical, ducts, or vents are permitted in the common separation wall. Electrical penetrations are required to be in accordance with R302.4
• California Building Code (CBC) requires that building materials and products used in the Wildland Urban Interface (WUI) zones meet certain ignition resistance and fire standards
• Recognizes FRCC OSB sheathing as an approved component of certain wall assemblies meeting the requirements of the California 12-7A-1 fire test for exterior walls
• FRCC OSB sheathing consists of a sheet of OSB with a non-combustible, fiberglass-reinforced magnesium oxide coating
o Designed to resist ignition, inhibit the spread of flames and slow the rate of heat transfer through the panel
o Applications: Fire-resistance-rated wall assemblies, roof decking (to satisfy vertical continuity of fire wall requirements), assemblies meeting California WUI fire hazard zone requirements, roof decks in Type II construction, SIP panels, and applications requiring a 15-minute thermal barrier
• Code-compliant or fire-rated materials must pass tests which measure strength and stiffness, bond durability and water resistance, flame spread, and fire resistance