Welcome to Today’s Event: Type III Fire -Resistant Design ... · meet. This presentation will...
Transcript of Welcome to Today’s Event: Type III Fire -Resistant Design ... · meet. This presentation will...
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Providing Market Education and Design Resources for Wood Construction
Hosted by:
Type III Fire-Resistant Designand Detailing:
Exterior Walls, Intersections and Balconies
Welcome to Today’s Event:
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WHAT WOODWORKS DOES
UW MercerCourt, credit WG Clark Construction and Ankrom Moisan Architects credit www.naturallywood.com
Cathedral of Christ the LightSkidmore, Owings & Merrill LLP
Cesar Rubio Photography
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U P C O M I N G O N L I N E E V E N T S
W E B I N A R SOctober 14 | Mass Timber Floor Vibration Design Guide: A New Resource for EngineersNovember 11 | Enclosure Design for Mass Timber Buildings
I N PA R T N E R S H I P W I T H H A N S O N W A D ESeptember 29 – 30 | Advancing Mass Timber Construction 2020
W O R K S H O POctober 7 | Wood Construction Applications in Industrial and Warehouse Facilities
S Y M P O S I U MNovember 18 - 19 | West Wood Design Symposium
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» Experts in wood design strategically located across the country
WoodWorks Team of Design ProfessionalsProvide One-on-One Support and Assistance
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F U NDI NG PART NE RS 2020
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MAR K E T D E V E LOP ME NT PART NE RS
B OAR D PART NE RS 2020
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Virtual exhibit hallLearn about and contact partners See link in
chat box and below
https://www.woodworks.org/about-woodworks/2020-partner-exhibit-hall/
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H O U S E K E E P I N G
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H A V E A Q U E S T I O N ?
Submit questions in the Q&A box at the bottom of your screen
as they come up in the presentations
We will get to as many questions as possible
Q&A box
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W AT C H F O R C O M M U N I C AT I O N F R O M U S
Today we will be sending links, files and other pertinent
information through the chat window, located at the bottom of
your screen
Chat window
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C O N T I N U I N G E D U C AT I O N C R E D I T S
All participants will receive a link to access a
certificate of completion through the chat box at the
end of today’s event.
AIA/CES CEUs will be submitted by WoodWorks
within 10 days.
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E V E N T E V A L U A T I O N
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W O O D W O R K S : P R E S E N TAT I O N S L I D E A R C H I V E
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THANK YOU FOR JOINING US – WE HOPE YOU ENJOY TODAY’S SEMINAR!
Keep your regional staff member in mind for questions and support:
Bruce LindseyNC, GA-North, SC, [email protected]
Terry Pattillo, AIADC, DE, MD, NJ, PA, WV, [email protected]
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Fire Resistant Design and Detailing: Firewalls, Fire Barriers and Fire Partitions
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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.
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Course Description
• With an increase in wood-frame buildings, more designers are seeking information on code-compliant and constructible detailing. Many are unsure of the code’s requirements for details, specifically at the intersection of rated assemblies and where structure and fire protection meet. This presentation will focus interior fire rated assemblies such as firewalls, fire barriers and fire partitions. Discussion will include issues of fire-resistance rating continuity, allowable uses of wood framing in rated assemblies, and allowable penetrations.
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Learning Objectives
1. Review methods for determining fire-resistance ratings.2. Discuss detailing aspects of fire resistance for fire walls, fire barriers and
fire partitions including material and assembly options, continuity, structural stability, and penetrations.
3. Explore requirements for horizontal assemblies.4. Understand requirements for individual encasement of beams and
columns.
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Outline
• Review of Fire Resistance Methods• Interior Fire Rated Wall Assemblies
• Fire Walls• Fire Barriers• Fire Partitions/Corridors
• Horizontal Assemblies• Beams
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Fire Resistance Ratings – IBC 703.2
Fire resistance of elements, components or assemblies shall be based on testing (ASTM E119):• UL Listings• Gypsum Catalog• Proprietary
Manufacturer Tests • Industry Documents:
such as AWC’s DCA3
OR…..
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Fire Resistance Ratings – IBC 703.3
Methods for determining fire resistance:• Prescriptive designs per IBC 721.1
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Fire Resistance Ratings – IBC 703.3
Methods for determining fire resistance:• Prescriptive designs per IBC 721.1• Calculated Fire Resistance per IBC 722.6
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Fire Resistance Ratings – IBC 703.3
Methods for determining fire resistance:• Prescriptive designs per IBC 721.1• Calculated Fire Resistance per IBC 722• Fire-resistance designs documented in sources• Engineering analysis based on a comparison• Fire-resistance designs certified by an approved agency
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Outline
• Review of Fire Resistance Methods• Interior Fire Rated Wall Assemblies
• Fire Walls• Fire Barriers• Fire Partitions/Corridors
• Horizontal Assemblies
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Fire-Resistance Rated Wall Assemblies
Fire Confinement Structural Performance
Fire-Resistance Rating: The period of time a building element, component or assembly maintains the ability to confine a fire, continues to perform a given structural function, or both, as determined by the tests, or the methods based on tests, prescribed in Section 703.Tested under a standardized test fire exposure for a given duration to:
1. Prevent the passage of flame and temperature rise from one side to the other
2. Continue to provide vertical structural support when exposed to fire and elevated temperatures
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Interior Fire-Rated Walls: Differences
Fire walls
• Building Separation
• Openings are protected and limited
• Continuous from foundation to/through roof and exterior wall to/through exterior wall
• Structural stability
Fire Barrier
• Shafts, Occupancy Separation
• Openings are protected and limited
• Continuous from floor through concealed space at each level
Fire Partition:
• Dwelling Unit Separation; Corridors
• Openings are protected
• May terminate at a fire rated floor/ceiling/roof assembly
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Interior Fire-Rated Walls: Differences
Fire walls
• Building Separation
• Openings are protected and limited
• Continuous from foundation to/through roof and exterior wall to/through exterior wall
• Structural stability
Fire Barrier
• Shafts, Occupancy Separation
• Openings are protected and limited
• Continuous from floor through concealed space at each level
Fire Partition:
• Dwelling Unit Separation; Corridors
• Openings are protected
• May terminate at a fire rated floor/ceiling/roof assembly
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Fire Partitions – IBC 708
• 708.4 Continuity. • Fire partitions shall extend from the top of the foundation or
floor/ceiling assembly below to the underside of the floor or roof sheathing, slab or deck above or to the fire-resistance-rated floor/ceiling or roof/ceiling assembly above, and shall be securely attached thereto. In combustible construction where the fire partitions are not required to be continuous to the sheathing, deck or slab, the space between the ceiling and the sheathing, deck or slab above shall be fireblocked or draftstopped in accordance with Section 718.2 and 718.3 at the partition line. • The supporting construction shall be supported to afford the
required fire-resistance rating of the wall supported, except for...walls separating dwelling units, walls separating sleeping units, and corridor walls, in buildings of Type IIB, IIIB and VB construction.
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Fire Partitions – IBC 708
Common Detailing Method: Fire Partition & membrane stop at underside of rated floor/ceiling with fireblocking/draftstopping if required
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Corridors – Fire Resistance Ratings
Check requirements of IBC Tables 601 and 1020.1 for Corridor Wall and Floor/Ceiling Fire-Resistance Ratings
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Corridors – Fire Resistance Ratings
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Corridor Walls
• IBC 1020.1: Corridor walls required to be fire-resistance rated shall comply with Section 708 for fire partitions.
• 708.3 Fire-resistance rating. • Fire partitions shall have a fire-resistance rating of
not less than 1 hour.
• Exception: Corridor walls permitted to have a 1/2hour fire-resistance rating by Table 1018.1 (applies to R occupancies with sprinkler systems)
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Corridor Walls• 708.4 Continuity.
• Fire partitions shall extend from the top of the foundation or floor/ceiling assembly below to the underside of the floor or roof sheathing, slab or deck above or to the fire-resistance-rated floor/ceiling or roof/ceiling assembly above, and shall be securely attached thereto.
• Exceptions:
• 2. Where the room-side fire-resistance-rated membrane of the corridor is carried through to the underside of the floor or roof sheathing, deck or slab of a fire-resistance-rated floor or roof above, the ceiling of the corridor shall be permitted to be protected by the use of ceiling materials as required for a 1-hour fire-resistance-rated floor or roof system.
• 3. Where the corridor ceiling is constructed as required for the corridor walls, the walls shall be permitted to terminate at the upper membrane of such ceiling assembly.
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Corridor Walls – 708.4 Exception 2
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Corridor Walls – 708.4 Exception 3
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Corridor decking
Floor sheathing
Joist hanger if joists perpendicular to wall
Corridors - 1hr Floor
Untreated
FRT Wood
Legend
Thinner framing with dropped ceiling allows main mechanical lines to run in corridor
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Interior Fire-Rated Walls: Differences
Fire walls
• Building Separation
• Openings are protected and limited
• Continuous from foundation to/through roof and exterior wall to/through exterior wall
• Structural stability
Fire Barrier
• Shafts, Occupancy Separation
• Openings are protected and limited
• Continuous from floor through concealed space at each level
Fire Partition:
• Dwelling Unit Separation; Corridors
• Openings are protected
• May terminate at a fire rated floor/ceiling/roof assembly
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Fire Barriers – IBC 707
• Commonly used in:• Shaft enclosures• Interior exit stairway• Exit stairway enclosures• Exit passageways• Incidental uses• Separated occupancies• Fire Areas
2012 IBC Code & Commentary
Fire Barrier Example
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Fire Barriers – IBC 707
• Fire Barriers:§ May be constructed with any
materials permitted by the construction type
§ Fire Resistance Ratings:• Shaft Enclosures: IBC 713.4• 2 Hr when connecting 4
stories or more, 1 hr if less
• Separated Occupancies: IBC Table 508.4
• Fire Areas: IBC Table 707.3.10
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Fire Barriers – IBC 707
• 707.5: Continuity: Fire barriers shall extend from the top of the foundation or floor/ceiling assembly below to the underside of the floor or roof sheathing, slab or deck above and shall be securely attached thereto. Such fire barriers shall be continuous through concealed space, such as the space above a suspended ceiling
• 707.5.1 Supporting Construction: The supporting construction for a fire barrier shall be protected to afford the required fire-resistance rating of the fire barrier supported. Hollow vertical spaces within a fire barrier shall be fireblocked in accordance with Section 718.2 at every floor level.
• Other requirements for openings, penetrations, joints
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Fire Barriers – IBC 707
Common Detailing Method: Fire Barrier & membrane extend to underside of floor deck above
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Interior Fire-Rated Walls: Differences
Fire walls
• Building Separation
• Openings are protected and limited
• Continuous from foundation to/through roof and exterior wall to/through exterior wall
• Structural stability
Fire Barrier
• Shafts, Occupancy Separation
• Openings are protected and limited
• Continuous from floor through concealed space at each level
Fire Partition:
• Dwelling Unit Separation; Corridors
• Openings are protected
• May terminate at a fire rated floor/ceiling/roof assembly
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Fire Walls – IBC 706
Each portion of a building separated by one or more fire walls shall be considered to be a separate building.
Building 1 Building 2
Fire Wall perIBC 706
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EXTERIOR WALL
FIRE WALL
FIRE WALL EXTENDSMIN. 18" BEYOND EXT.
SURFACE OF EXT. WALL
FIRE WALL TO EXTERIOR WALL: OPTION 1
Fire walls are required to be continuous from exterior wall to exterior wall
Fire Walls - Horizontal Continuity
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Fire Walls – Ratings & Materials
IBC 706.3 – Fire walls shall be of any approved non-combustible materials.
Exception: Buildings of Type V construction
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Fire Walls – Horizontal Continuity
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Fire Walls – Horizontal Continuity
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Fire Walls – Horizontal Continuity
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Fire Walls – Vertical Continuity
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Fire Walls – Vertical Continuity
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Fire Walls – Vertical Continuity
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Fire Walls – Vertical Continuity
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Fire Walls – Vertical Continuity
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Fire Walls – Structural Stability
706.2 Structural Stability: Fire walls shall have sufficient structural stability under fire conditions to allow collapse of construction on either side without collapse of the wall for the duration of time indicated by the required fire-resistance rating or shall be constructed as double fire walls in accordance with NFPA 221.
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NFPA 221
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NFPA 221 – Double Walls
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2 Hour Fire Wall Assembly
2"HOUR DOUBLE STUD WALL
2 X FRAMING AT 16" O.C.
2"HOUR RATING PER GA FILE NO. WP 3820
WOOD STRUCTURAL PANELS WHEREREQUIRED FOR SHEAR
RESILIENT DRAFT STOPS ATMAX. 10' O.C. HORIZONTAL
2 LAYERS 5/8" TYPE 'X' GYPSUMBOARD EACH SIDE
BATT INSULATION AS REQUIRED FOR THERMAL/ACOUSTICALPERFORMANCE
AIR
GAP
0' "
1"
Construction Type:• V
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2 Hour Fire Wall Assembly
Construction Type:• V
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2 Hour Fire Wall Assembly
2"HOUR FIRE WALL ASSEMBLY
2 1/2" METAL STUDS AT 24" O.C.
2 LAYERS 5/8" TYPE 'X' GYP. BD. ON EACH SIDE OF METAL STUDS
WOOD STRUCTURAL PANELS WHERE REQUIRED FOR SHEAR
2"HOUR RATING PER GA FILE NO. WP 1548
WOOD STUD WALLS ON EITHERSIDE OF FIRE WALL
AIR
GA
P
0' "
1"
AIR
GA
P
0' "
1"
INTERIOR OR EXTERIOR FINISH AS REQUIRED
BATT INSULATION (OPTIONAL)
CAD & Revit Details: www.woodworks.org
Construction Types:• III• IV• V
GA WP 1548UL U411
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2 Hour Fire Wall Assembly
Construction Types:• III• IV• V
Also see UL U336
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Fire Walls – Ratings & Materials
Opportunity for Wood Framed Fire Walls:
• Permitted in type V Construction
• Fire Walls in type V Construction of A, B, E, R and several other occupancies may be 2 hour
Fire Walls in type III and IV construction are required to be constructed of non-combustible materials
• Opportunity for wood frame bearing walls on each side of fire wall to meet structural stability requirements
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3 Hour Fire Wall Assembly
• (2) 1” Type X Gypsum• 2” H Studs• 2” mineral fiber insulation
each side
Construction Types:• III• IV• V
Could install wood bearing wall on each side of 3 hour wall
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3 Hour Fire Wall Assembly
3"HOUR FIRE WALL ASSEMBLY
1 5/8" METAL STUDS AT 24" O.C. MAX.
3 LAYERS 1/2" TYPE 'X' GYP. BD. ON EACH SIDE OF METAL STUDS
WOOD STRUCTURAL PANELS WHERE REQUIRED FOR SHEAR
3 HOURS PER UL DESIGN NO. U435
WOOD STUD WALLS ON EITHERSIDE OF FIRE WALL
AIR
GAP
0' "
1"
AIR
GAP
0' "
1"
INTERIOR OR EXTERIOR FINISH AS REQUIRED
BATT INSULATION (OPTIONAL)
Construction Types:• III• IV• V
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3 Hour Fire Wall Assembly
Could install wood bearing wall on each side of 3 hour wall
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Fire Walls – Seismic Diaphragm Continuity
CAD & Revit Details: www.woodworks.org
3"HOUR FIRE WALL AT FLOOR/CEILING
3"HR. ASSEMBLY: 1 5/8" METALSTUDS WITH 3 LAYERS 1/2" TYPE 'X'
GYP. BD. EACH SIDE
3"HOUR FIRE CAULKING
1" AIR GAP
RESILIENT CHANNELS
2 X 4 STUD WALL EACH SIDE, WITHSTRUCTURAL WOOD PANELS AS
REQUIRED FOR SHEAR AND 1 LAYER5/8" TYPE 'X' GYP. BD.
CONTINUOUS 13 1/2" WIDE 14 GA. GALV.SHT. METAL
CONTINUOUS 16 GA. TRACK TOP ANDBOTTOM
FIRE SAFING
CONTINUOUS 16 GA. COMP. CHANNEL
WOOD TRUSS FRAMING WITHOUT WOOD PANEL DIAPHRAGM RUNNING THROUGH FIRE WALL3"HOUR FIRE WALL AT FLOOR/CEILING
3"HR. ASSEMBLY: 1 5/8" METALSTUDS WITH 3 LAYERS 1/2" TYPE 'X'
GYP. BD. EACH SIDE
CONTINUOUS STRUCTURAL WOODPANELS " USE FIRE"TREATED PANELS
THROUGH WALL CAVITY¹
¹CONSULT LOCAL JURISDICTION HAVING AUTHORITY FOR ACCEPTANCE OF FIRE"TREATED WOODPANELS RUNNING THROUGH 3"HOUR ASSEMBLY IN THIS APPLICATION.
RIM JOIST WITH SOLID BLOCKING
3"HOUR FIRE CAULKING
1" AIR GAP
RESILIENT CHANNELS
2 X 4 STUD WALL EACH SIDE, WITHSTRUCTURAL WOOD PANELS AS
REQUIRED FOR SHEAR AND 1 LAYER5/8" TYPE 'X' GYP. BD.
I"JOIST FRAMING WITH WOOD PANEL DIAPHRAGM RUNNING THROUGH FIRE WALL
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Fire Walls – Seismic Diaphragm Continuity
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Fire Walls – Seismic Diaphragm Continuity
New 2018 IBC Provisions Allow Floor Sheathing Through Firewall under Certain Conditions
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Outline
• Review of Fire Resistance Methods• Interior Fire Rated Wall Assemblies
• Fire Walls• Fire Barriers• Fire Partitions
• Horizontal Assemblies• Beams
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• A floor or roof assembly required to have a fire resistance rating such as for occupancy separations and fire area separations
• May be constructed with any materials permitted by the construction type
• Occupancy separation: Fire resistance ratings per IBC Table 508.4
• Required to be continuous without vertical openings except as permitted in IBC 712
• Supporting construction required to have same fire-resistance rating as the fire barrier being supported (with exceptions per 711.4)
• Other requirements for openings, penetrations, joints
Horizontal Assemblies
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Fire Resistance Ratings – 711.2.4
Fire resistance shall not be less than that required for:• Separating mixed occupancies – 508.4
• Up to 1hr for sprinklered for other than I and H occupancy
• Up to 2hr for non-sprinklered for other than I and H occupancy
• Separating fire areas – 707.3.10• 2hr for most occupancies for other than H and F-1• 3hr for S1/ 1hr for U
• Dwelling units – not less than 1hr• Except for IIB, IIIB, VB with NFPA 13 sprinklers is ½ hr
• Separating smoke compartments – 709• Separating incidental uses – 509
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"The addition of up to 16-3/4 inches of 0.5 pcfglass fiber insulation (R-40), either batt or loose-fill, to any 1- or 2-hour fire resistance rated floor-ceiling or roof-ceiling system having a cavity deep enough to accept the insulation is permitted provided that one additional layer of either 1/2 inch or 5/8 inch type X gypsum board is applied to the ceiling. The additional layer of gypsum board shall be applied as described for the face layer of the tested system except that the fastener length shall be increased by not less than the thickness of the additional layer of gypsum board."
-Section 1.12 Gypsum Association’s Fire Resistance Design Manual
Fire Resistance – Insulation Effects
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Trusses
"Specified floor-ceiling and roof-ceiling framing sizes or truss dimensions are minimums. Greater joist or truss sizes (depths) shall be permitted to be used in metal- or wood-framed systems.“
-Section 1.17 Gypsum Association’s Fire Resistance Design Manual
"Thus, larger and deeper trusses can be used under the auspices of the same design number. This approach has often been applied to roof truss applications since roof trusses are usually much deeper than the tested assemblies".
- WTCA's Metal Plate Connected Wood Truss Handbook
TSC/FCA 60-101. Topping (optional)2. Flooring - min ¾” plywood3. Truss – min depth 10”, spaced at 24”oc4. Bridging/Strongback5. 2 layers ½” Type X Gyp6. Insulation (optional) – supported by metal furring
or 1x3 wood furring strips at 16” oc. “Equivalent methods that retain insulation above joist bottom flange are acceptable”
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Shallow Floor Depths
Common issues with UL approved assemblies:• Shallow Floor depth-
• Use prescriptive assemblies - IBC 721.1(2) assembly 14-1.1
• Or use the CAM method in IBC 722
• Use of Structural Composite Lumber
• Manufacturer’s ESR shows equivalent fire performance to solid sawn
• 1” gypsum underlayment• 19/32” WSP• 3 ½” Fiberglass Batt• 2x10 joists @24 “ oc• Resilient channel• 5/8” Type-X Gyp
UL L502GA FC5104
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• IBC 2012 714.4.1.2, Except. 7: Permitted if wall is rated to match horizontal assembly
• IBC 2015 714.4.2, Except. 7: Permitted if wall is covered with type X gypsum each side
RAT
ED F
LOO
RA
SSEM
BLY
DOUBLE TOP PLATE OF WALLINTERRUPTS CEILING GYPSUM
PARTITION WALL
PARTITION WALL
INTERIOR WALL TO FLOOR INTERSECTION
Assembly Intersection
Can a wall interrupt the ceiling gypsum of a rated horizontal assembly?
Yes!
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Joint vs. Assembly Intersection
SECTION 202DEFINITIONS
Joint. The opening in or betweenadjacent assemblies that is createddue to building tolerances, or isdesigned to allow independentmovement of the building in any planecaused by thermal, seismic, wind orany other loading.
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Joints
• Truss manufactures often recommend a gap to accommodate deflection between the bottom chord and interior non-bearing walls. How is that detailed?
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Joints – IBC 715
• Exceptions to rated joints:• Walls that allow unprotected
openings • Control joints not exceeding
.625” and tested in E119 assembly
• Joint Assemblies available through UL Directory
• not easily searchable• HWS or HWD• very few wood
assemblies• joint manufacturer may
supply engineering judgement•
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Joint Systems
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BEARING WALL STRUCTURE. A building or other structure in which verticalloads from floors and roofs are primarily supported by walls.
FRAME STRUCTURE. A building or other structure in which vertical loads fromfloors and roofs are primarily supported by columns.
Individual Encasement - Column
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Light Frame Bearing Walls -IBC 704.4.1
Typ. Bearing Wall Opening Framing
704.4 Protection of secondary members.Secondary members that are required tohave a fire resistance rating shall beprotected by individual encasementprotection, by the membrane or ceiling of ahorizontal assembly in accordance with 711,or by a combination of both.
704.4.1 Light Frame Construction.King Studs and boundary elements that areintegral elements in load-bearing walls oflight-frame construction shall be permitted tohave required fire-resistance ratings providedby the membrane protection provided for theload-bearing wall.
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Individual Encasement - Column
http://www.woodworks.org/ask-an-expert/
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2018 IBC -SECTION 704FIRE RESISTANCE RATING OF STRUCTURAL MEMBERS
704.2 Column protection.Where columns are required to have protection to achieve a fire-resistance rating, the entirecolumn shall be provided individual encasement protection by protecting it on all sides for the fullcolumn length, including connections to other structural members, with materials having therequired fire resistance rating. Where the column extends through a ceiling, the encasementprotection shall be continuous from the top of the foundation or floor/ceiling assembly belowthrough the ceiling space to the top of the column.Exception: Columns that meet the limitations of Section 704.4.1
704.4.1 Light-frame construction.Studs, columns and boundary elements that are integral elements in walls of light-frameconstruction and are located entirely between the top and bottom plates or tracks shall bepermitted to have require fire-resistance ratings provided by the membrane protection providedfor the wall
Light Frame Bearing Walls – 2018 IBC
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2015 IBC Code and Commentary
on 704.2“Columns that provide inherent fire
resistance, without encasement, such as heavy timber, are considered as not requiring protection and do not need to comply with this section.”
Column Fire Resistance
- Gypsum Association Fire Resistance Design Manual
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Column vs. Boundary Elements
• If posts/stud packs in a wall lie between plates:• Considered “secondary members” by not having direct
connection to the columns and covered by exceptions • Fire rating can be provided by membrane• Per Table 601, need to be 2hr rated for IIIA and 1 hr for VA
• If posts/stud packs break the top and/or bottom plate:• May be considered primary frame and be considered a
“column” member• Need to be individually encased• Per Table 601, need to be rated to 1hr for IIIA and VA
construction• Protection can be provided by charring effects • Protection of connections needs to be considered
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Beam Encasement
BEARING WALL STRUCTURE. A building or other structure in which verticalloads from floors and roofs are primarily supported by walls.
FRAME STRUCTURE. A building or other structure in which vertical loads fromfloors and roofs are primarily supported by columns.
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704.3 Protection of the primary structural frameother than columns.Members of the primary structural frame other thancolumns that are required to have protection toachieve a fire-resistance rating and support morethan two floors or one floor and roof, or support aload-bearing wall or a non load-bearing wall morethan two stories high, shall be provided individualencasement protection by protecting them on allsides for the full length including connections toother structural members, with materials having therequired fire-resistance rating.
Exception: Individual encasement protectionon all sides shall be permitted on all exposed sidesprovided the extent of protection is in accordancewith the required fire resistance rating asdetermined in Section 703.
Beam Encasement
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IBC 703.3 Alternate Methods for determining fire resistance• Prescriptive designs per IBC 721.1
• Calculations in accordance with IBC 722• Fire-resistance designs documented in sources• Engineering analysis based on a comparison• Alternate protection methods as allowed by 104.11
IBC 722 Calculated Fire Resistance“…The calculated fire resistance of exposed wood members and wood decking shall be permitted in accordance with Chapter 16 of ANSI/AF&PA National Design Specification for Wood Construction (NDS).”
NDS Chapter 16 Fire Design of Wood MembersLimited to calculating fire resistance up to 2 hours.Char rate varies based on endurance required, product type and lamination thickness. Equations and tables provided.TR10 and NDS commentary are helpful in implementing permitted calculations.
Exposed Framing Fire Resistance
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http://awc.org/pdf/codes-standards/publications/tr/AWC-TR10-1510.pdfSource: 2015 NDS Chapter 16http://awc.org/pdf/codes-standards/publications/nds/AWC-NDS2015-ViewOnly-1411.pdf
Exposed Framing Fire Resistance
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Questions?This concludes The American Institute of Architects Continuing Education Systems Course
Terry Pattillo, AIAMid-Atlantic Regional DirectorWoodWorks – Wood Products [email protected](919) 995-6672