International Building Code Essentials for Wood Construction Paul D

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International Building Code Essentials for Wood Construction Paul D. Coats, PE, CBO Southeast Regional Manager, American Wood Council 1 “The Wood Products Council” is a This course is registered with Registered Provider with The AIA CES for continuing American Institute of Architects professional education. As such, Continuing Education Systems it does not include content that (AIA/CES), Provider #G516. may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or Credit(s) earned on completion of manner ofhandling, using, this course will be reported to AIA distributing, or dealing in any CES for AIA members. Certificates material or product. of Completion for both AIA ______members and non-AIA members Questions related to specific materials, are available upon request. methods, and services will be addressed at the conclusion of this presentation.

This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of AWC is prohibited.

3 Course Description

• Based on the American Wood Council (AWC)/International Code Council publication, Code Conforming Wood Design (CCWD), this presentation provides insight into the 2012 International Building Code (IBC) parameters for wood in non-residential and multi-residential construction. Topics will include maximum building sizes (participants will receive pre-calculated tables for eight occupancies, with and without frontage and sprinkler increases); alternatives for establishing required fire resistance; special provisions for pedestal buildings; precautionary recommendations during construction; criteria for finishes, and other wood features; and the use of AWC design standards and other publications in relation to the IBC. Participants may download a complimentary copy of the CCWD at: http://www.awc.org/codes/ccwdindex.html.

4 Objectives

Upon completion, participants will be better able to: 1. Identify building size and use parameters for wood as the primary structural elements. 2. Identify methods specified by the code for establishing fire resistance of wood assemblies and elements, and fire precautions during construction. 3. Apply special provisions for design of wood structures that involve compartmentalization and sprinkler systems. 4. Apply code provisions for the non-structural use of wood in buildings, such as for finishes, appendages, siding, and trim.

5 CCWD Document

• This program is based on the Code Conforming Wood Design (CCWD) document

• The CCWD is intended as a brief yet comprehensive resource for wood design in accordance with the IBC

• Download at (go to “Codes and Standards” and then “Codes”; or just type “CCWD” in the search

box) 6

Outline

• Building Size • Fire Resistance • Wood Features in Buildings • Precautions During Construction • Highlights 2015 IBC

7 International Building Code

• The IBC • Controls building size • Regulates types of materials • Stipulates fire-resistance

8 International Building Code

• Concept Fire and Smoke Protection include: • Structural fire-resistance • Limitation of Fire Spread • Protection of Exitways • Radiant Heat Exposure • Restriction of Smoke Movement

9 OCCUPANCY p. 2-5 of the CCWD

10 Classifications p. 2

• Group A, Assembly occupancies • Group B, Business occupancies • Group E, Educational occupancies • Group F, Factory/Industrial occupancies • Group I, Institutional occupancies • Group M, Mercantile occupancies • Group R, Residential occupancies • Group S, Storage occupancies

p. 5-6 of the CCWD

TYPE OF CONSTRUCTION Types of Construction p. 5

. IBC Chapter 6 • Defines types of construction • Type I & II Non-combustible • Type III Non-combustible & Combustible • Type IV & V Combustible • Wood frame construction is typical in Types III, IV, and V

13 BUILDING SIZE p. 7-12 of the CCWD

14 Allowable Heights and Areas

. IBC Chapter 5 contains the general criteria for wood building size • Size thresholds for wood structures are often determined by structural considerations rather than code limitations

15 Table 503 Excerpt, Allowable Building Heights and Areas p. 8

Type of Construction

Height Type III Type IV Type V (ft) Group A B HT A B 65 55 65 50 40 Stories (S) Area (A) S 3 2 3 2 1 A-3 A 14,000 9,500 15,000 11,500 6,000 S 5 3 5 3 2 B A 28,500 19,000 36,000 18,000 9,000 S 3 2 3 1 1 E A 23,500 14,500 25,500 18,500 9,500 S 4 2 43 3 1 M A 18,500 12,500 20,500 14,000 9,000 S 4 4 4 3 2 R-1 A 24,000 16,000 20,500 12,000 7,000 S 4 4 4 3 2 R-2 A 24,000 16,000 20,000 12,000 7,000 S 3 2 4 3 1 S-1 A 26,000 17,500 25,500 14,000 9,000 Table 503 Allowable Building Heights and Areas Maximum Allowable Area p. 9 Section 506 Allowable building area per story

Aa = {At + [At x If] + [At x Is]} (EQ. 5-1, base equation) Frontage Sprinkler EQ 5-2, factor open frontage

If = (F / P – 0.25) x W / 30

(EQ 5-3, weighted average for the width of the open space)

W = (L1 × w1 + L2 × w2 + L3 × w3…) / F

(w = 20’ min. & 30’ max unless public way) NEW

EQ. 18

Maximum Allowable Area

Interior Lot Lines

L1 = 120 ft, W1 = 15 ft 2012 IBC Clarification

L2 = 180 ft L4 = 180 ft,

W2 = 25 ft W4 = 30 ft + 22 ft = 52 ft

L3 = 120 ft, See p. W3 = 10 ft + 22 ft = 32 ft 11 of CCWD

Lot Lines CL Public Way 22ft Street Width

W vs. Fire Separation Distance

Bldg. 1 line lot imaginary Bldg. 2 FSD

W vs. Fire Separation Distance

lot line lot W

Bldg. 1 Bldg. 2 FSD

FSD

centerline of public way W Sprinkler system increases

. When a building is equipped throughout with an NFPA 13- compliant automatic sprinkler system (Section 903.3.1.1), the allowable floor area is permitted to be increased:

. Is •Single-story building – 3x •Multistory building – 2x

Allowable Building Area Calculation

•Given: Single-story Type VB grade school •Provided with an NFPA 13-compliant automatic sprinkler system throughout and located on lot as shown.

Determine: Maximum allowable 100′ building area 250′ 60′ (see pg. 12 of CCWD) 40′

Maximum Allowable Area

Aa = {At + [At x If] + [At x Is]} (Equation 5-1)

Aa = {9500 + [9500 x If] + [9500 x Is]} (Table 503)

If = (F / P – 0.25) x W / 30 (Equation 5-2)

If = (350/700 – 0.25) x 30/30 = .25 (where W > 30, use 30)

100′ 60′ 250′ 40′

Maximum Allowable Area

Aa = {At + [At x If] + [At x Is]} (Equation 5-1)

Aa = {9500 + [9500 x If] + [9500 x Is]} (Table 503)

If = (F / P – 0.25) x W / 30 (Equation 5-2)

If = (350/700 – 0.25) x 30/30 = .25 (where W > 30, use 30)

Is = 3 for single story (Section 506.3)

Aa = {9500 + [9500 x .25] + [9500 x 3]}

Aa = 40,375 100′ 60′ Actual area = (250)(100) = 25,000 250′ OK 40′ CCWD

• About height limits . . .

26 Table 503 Excerpt, Allowable Building Heights and Areas

Type of Construction

Height Type III Type IV Type V (ft) Group A B HT A B 65 55 65 50 40 Stories (S) Area (A) S 3 2 3 2 1 A-1 A 14,000 8,500 15,000 11,500 5,500 S 3 2 3 2 1 A-2 A 14,000 9,500 15,000 11,500 6,000 S 3 2 3 2 1 A-3 A 14,000 9,500 15,000 11,500 6,000 S 3 2 3 2 1 A-4 A 14,000 9,500 15,000 11,500 6,000 S UL UL UL UL UL A-5 A UL UL UL UL UL S 5 3 5 3 2 B A 28,500 19,000 36,000 18,000 9,000 S 3 2 3 1 1 E A 23,500 14,500 25,500 18,500 9,500 Table 503 Excerpt, Allowable Building Heights and Areas

Type of Construction

. In addition to the area increase, Section 504.2 also permits the Table 503 building heights to be increased: • 20 feet • 1 story above grade.

NFPA 13

Height Increases for Sprinklers

Table 503 limit

Height Increases for Sprinklers

+ 1 story and 20 ft.

Table 503 limit CCWD

• About Chapter 9 sprinkler thresholds . . .

32 Chapter 9 Area Limits for Nonsprinklered Buildings

• Many occupancies have floor area limits allowed by Chapter 5 that are greater than those permitted in Chapter 9 for nonsprinklered buildings • The same thresholds apply to all construction types, not just wood. The allowable area per story can exceed allowable fire areas and a sprinkler system may be required

Chapter 9 Area Limits for Nonsprinklered Buildings

Sprinkler Trade-offs

• Reductions in corridor ratings and corridor opening protection • Flexibility in means of egress (travel distance to exits, number and separation of exits, common path of travel) • Reductions in dwelling unit separations • Alternate to emergency escape openings • Alternate to certain fire and smoke damper requirements • Interior finish flexibility • Other trade-offs CCWD

• About total building area limits. . .

36 Single Occupancy

Buildings three or more stories above grade have a total building area of the allowable building area per story (Aa) multiplied by three (Section 506.4)

Building Area

• Based on Single Story Maximum Area • Assume a maximum area (Aa) of 37,500 ft per story

37,500

Building Area

• Two story building: • Total allowable building area Atotal = 2(Aa)

37,500

Building Area

• Three story building • Total allowable building area Atotal = 3(Aa)

37,500

Building Area

• Four story building • Total allowable building area Atotal remains 3(Aa)

Building Area

• Four story building • Total allowable building area Atotal remains 3(Aa)

Building Area

• Four story building • Total allowable building area Atotal remains 3(Aa)

Building Area

• Four story building • Total allowable building area Atotal remains 3(Aa)

37,500 28,125

37,500 28,125 (total building area 28,125 = (3)(37,500) = 37,500 112,500; 112,500/4 28,125 28,125 = 28,125 per story)

37,500 28,125 28,125

Building Area

• Four story building of unequal stories: • Atotal = 3(Aa), and no single story > (Aa)

28,125

28,12537,500

Building Area

• Four story building of unequal stories: • Atotal = 3(Aa), and no single story > (Aa)

28,125

28,12537,500

Building Area

• Four story building of unequal stories: • Atotal = 3(Aa), and no single story > (Aa)

28,125 25,000

28,12537,500 CCWD

• Now using the CCWD tables . . .

48 Table 5 (p. 32) – Group E Nonsprinklered Buildings – Maximum floor area per story a, b, c

Group E Nonsprinklered Buildings a, b, c # of % Maximum floor area per story (sq. ft.) stories frontage IIIA IIIB IV VA VB 0-25 23,500 14,500 25,500 12,120 9,500 1 50 29,370 25,370 31,870 22,500 11,870

100 41,120 33,250 44.,620 32,370 16,620

0-25 23,500 14,500 25,500 NP NP 2 50 29,370 18,120 31,870 NP NP 100 41,120 25,370 44,620 NP NP

0-25 23,500 NP 25,500 NP NP 3 50 29,370 NP 31,870 NP NP

100 41,120 NP 44,620 NP NP Footnotes – Table 5 (p. 32) Group E, Nonsprinklered Buildings

• Footnotes • Frontage based on open space widths of 30 feet or more. • Interpolation permitted. • Sprinklers must be provided for Group E occupancies when the fire area exceeds 12,000 square feet in accordance with Section 903.2.3, or by reason of other specific conditions in that section. In lieu of sprinklers, compartmentalization of the floor area into fire areas not more than 12,000 square feet can be provided with fire-resistance-rated construction in accordance with Chapter 7.

Example – Group E

•Given: Single-story Type VB grade school •Provided with an NFPA 13-compliant automatic sprinkler system throughout and located on lot as shown Determine: Maximum allowable building area

100′ 60′ 250′ 40′

Example – Group E

•Frontage Increase (Section 506.2) •50 % of the open space qualifies for the frontage increase

100′ 60′ 250′ 40′

Example – Group E

Table 6 (p. 32) – Group E NFPA 13-Compliant Sprinklered Buildings – Maximum floor area per story a, b, c Maximum floor area per story (sq. ft.) # of %

stories frontage IIIA IIIB IV VA VB 0-25 94,000 58,000 102,000 74,000 38,000 1 50 99,870 61,620 108,370 78,620 40,370 100 111,620 68,870 121,120 87,870 45,120 0-25 70,500 43,500 76,500 55,500 28,500 2, 3 50 76,370 47,120 82,870 60,120 30,870 100 88,120 54,370 95,620 69,370 35,620 0-25 52,870 NP 57,370 NP NP 4 50 57,280 NP 62,150 NP NP 100 66,090 NP 71,710 NP NP CCWD

• About mixed occupancies . . .

Mixed Occupancy

• Mixed occupancy buildings are permitted a total allowable building area calculated in accordance with Section 506.5

Mixed Occupancy

• Mixed occupancy buildings are permitted a total allowable building area calculated in accordance with Section 506.5 • Section 508.3 Nonseparated R

Mixed Occupancy

• Mixed occupancy buildings are permitted a total allowable building area calculated in accordance with Section 506.5 • Section 508.3 Nonseparated R • Section 508.4 Separated R

Mixed Occupancy

• Mixed occupancy buildings are permitted a total allowable building area calculated in accordance with Section 506.5 • Section 508.3 Nonseparated

• Section 508.4 Separated R

• Section 506.5 Single and multistory R mixed occupancy buildings B

p. 16-17 of the CCWD STACKED BUILDINGS

Stacked Buildings

• Buildings of different types of construction and occupancy are allowed to be built on top of each other--they are commonly referred to as pedestal buildings 510.2 Horizontal Building Separation Allowance

• 3-hr rated Horizontal Assembly required between the lower and upper buildings • Limits in Section 510.2 • Group B, M and R occupancies and Group S-2 open and enclosed parking garages are permitted in either building • Multiple Group A occupancies, each with an occupant load of less than 300, are also permitted in either building • Group S occupancies other than parking garages are permitted only in the upper building

Building Height – Stacked Buildings

• Building Height – in feet • Upper building height (feet) is measured from grade plane • Building Height – stories • Upper building height (stories) – measured from top of lower building

Upper Upper Building Business Building Height – 12 ft Occupancy – floors Height – 4 per story, 5 2 thru 5 stories stories Closed Parking 12 x 5 = 60Grade ft Garage – 1st Plane floor

Stacked Buildings

• See other alternatives for stacked buildings in subsections 510.3 through 510.9

p. 14 of the CCWD

UNLIMITED AREA BUILDINGS

One or Two-story - Sprinklered

• Unlimited area Group B, F, M and S • Limits in Section 507.3 • Building must be equipped throughout with an NFPA 13-compliant automatic sprinkler system • Must be surrounded on all sides by public ways or yards not less than 60 feet wide

One-story - Sprinklered

• Group A-1 and A-2 occupancies are allowed in unlimited area mixed occupancy buildings containing Group B, F, M or S occupancies • Limits in Section 507.3.1 • Type III or IV construction • Occupancies are separated as required in Section 508.4.4 • All exit doors from Group A-1 and A-2 occupancies must discharge directly to the exterior of the building

One-story - Sprinklered

• Unlimited area Group A-3 buildings • Limits in Section 507.7 • Type III or IV construction • Building used for religious worship, community hall, dance hall, exhibition hall, gymnasium, lecture hall, indoor swimming pool or tennis court • Unlimited area Group A-4 buildings • Limits in Section 507.3 • Type IIIA, IIIB and IV construction • Building used for indoor sporting events

One-story - Sprinklered

• Unlimited area Group E buildings • Limits in Section 507.10 • Type IIIA or IV construction • Each classroom must have two means of egress, with one means of egress a direct exit to the outside of the building • Must be surrounded on all sides by public ways or yards not less than 60 feet wide

Reduced Open Space

• There must be at least 40 feet open width provided and the exterior wall and all openings on those portions will require 3-hour minimum fire-resistance and fire protection ratings.

3-hr fire rating 70 ft required on walls and all openings 450 ft 65 ft 100 ft 100 ft 40ft 450 ft 45 ft

p. 16 of the CCWD FIRE WALLS

Fire Walls

• Fire walls define separate buildings for allowable building size (706) • Not fire barriers (707) • Not fire partitions (708) • Not smoke barriers, smoke partitions, or horizontal assemblies

Fire Walls

• Type V construction: • Fire walls may be wood frame • Types III and IV construction: • Fire walls must be of noncombustible materials in accordance with Section 706.3

p. 17-18 of the CCWD FIRE RESISTANCE Table 601 Table 601 Fire-resistance Rating Requirements For Building Elements (hr) TYPE TYPE I TYPE II TYPE III TYPE V BUILDING ELEMENT IV A B Ad B Ad B HT Ad B Primary structural frameg (see Section 202) 3a 2a 1 0 1 0 HT 1 0

Bearing walls, Exteriorf, g 3 2 1 0 2 2 2 1 0 Interior 3a 2a 1 0 1 0 1/HT 1 0 Nonbearing walls and partitions, Exterior See Table 602

Nonbearing walls and See partitions, Interiore 0 0 0 0 0 0 Section 0 0 602.4.6 Floor construction and associated secondary 2 2 1 0 1 0 HT 1 0 members (see Section 202)

Roof construction and associated secondary 1-1/2b 1b,c 1b,c 0c 1b,c 0 HT 1b,c 0 members (see Section 202) Table 602 Methods for Determining Fire-Resistance (703)

(703.2) Tested fire assembly (ASTM E 119 or UL 263) (703.3) 1. Fire-resistance designs documented in approved sources 2. Prescriptive assemblies using of fire-resistance-rated designs in Section 721 3. Calculation of fire-resistance per Section 722 4. Engineering analysis based on a comparison of building element, component or assembly designs that have been tested 5. Alternative protection methods per Section 104.11 6. Fire-resistance designs certified by an approved agency

Tested Assembly

• Tested to the ASTM E 119 or UL 263 standard • Choose listed assemblies from fire-resistance publications or directories

Prescriptive Assembly

• Fire-resistance of certain wood assemblies is prescribed in Section 721 based on testing using ASTM E 119 or UL 263

• Fire-resistance designs documented in approved sources DCA 3 Chapter 16 – Fire (ASD) • Fire resistance up to two hours • Columns • Beams • Tension Members • ASD only • Products • Lumber • Glulam … • SCL • Decking

Calculated Resistance

• Fire resistance of exposed wood members may be calculated using the provisions of Chapter 16 of the National Design Specification® (NDS®) Chapter 16 – Fire (ASD)

Technical Report No. 10

www. awc.o rg Chapter 16 – Fire (ASD)

Code Updates - Design of Fire- Resistive Exposed Wood Members

http://www.awc.org /publications/downl oad.php

www. awc.o rg

Calculated Resistance

• Fire resistance of wood frame assemblies also may be calculated based on the known fire resistance of the components, using the provisions of Section 722.6 (Component Additive Method)

National Research Council of Canada in the 1960s

Calculated Resistance

• Document of origin in AWC’s DCA-4, containing all the same provisions, with background • Ten Rules of Fire Resistance Rating (Harmathy’s Rules) Engineering Analysis Based on Comparisons of Tested Elements

• Engineering analysis—one of the original five alternatives for establishing ratings • Based on comparison of tested elements • DCA-4 embodies this for 1-hour assemblies • It can be applied to other elements and other ratings with appropriate and qualified fire protection engineering judgment

p. 19-25 of the CCWD

WOOD FEATURES IN BUILDINGS

Wood Interior Finish

• Wood materials may be used as interior finish in almost all occupancies

105 Wood Interior Finish – Nonsprinklered Buildings (p. 20, CCWD; T803.9 IBC) Nonsprinklered Buildings: Minimum Interior Finish Classification by Occupancy Location Minimum Interior Finish Classification Ab B C Exit enclosures A, B, E, I, M, F, S, R-2 R-3 and exit R-1, R-4 passagewaysc

Corridors Ad, I-2, I-3, I-4 B, E, M, S, I-1, F, R-3 R-1, R-2, R-4

Enclosed I, A-1, A-2, A-3, A-4, A-5, B, spaces and R-4 E, F, M, S, R-1, rooms R-2, R-3

Flame spread (0-25) (26-75) (76-100) Wood Interior Finish – Sprinklered Buildings (p. 21, CCWD; T803.9, IBC)

Sprinklered Buildings: Minimum Interior Finish Classification by Occupancya, b Location Minimum Interior Finish Classification A Bc C Exit I-3 A, B, E, M, R- F, R-2, R-3, S enclosures 1, R-4, I-1, I-2, and exit I-4 passageways d Corridors I-3 A, I-2, I-4 B, E, F, M, R, S, I-1 Enclosed I-2, I-4 A, B, E, F, M, spaces and R, S, I-1, I-3 rooms Wood Interior Finish

803.1 . Class C - wood species . Class B - some, such as cedar, west coast hemlock, Idaho white pine, redwood, and spruce . Class A - wood boards and panels when pressure treated with a fire- retardant chemical.

DCA 1 http://www.awc.org/co des/dcaindex.php

108

Wood Interior Finish

• Exceptions (803.3): • Traditional wood floor covering (804.1) • Exposed portions of Type IV structural members (803.3)

p. 25-26 of the CCWD

PRECAUTIONS DURING CONSTRUCTION

Precautions During Construction

Fire Extinguishers - 3309

• During construction, one portable fire extinguisher must be placed: • At each stairway on all floor levels with combustible materials, • At each storage or construction shed and where special hazards exist

Maintaining Means of Egress - 3310

• During construction, when a building height reaches 50 feet or four stories, a minimum of one temporary lighted stairway must be provided unless a permanent stairway is available for use at all times

Standpipes - 3311

• A minimum of one standpipe must be available during construction for fire department use • The standpipe must be installed before the construction is 40 feet above fire department access; see other conditions

Sprinkler System Commissioning - 3312

• Sprinkler system must be tested and approved before the certificate of occupancy is granted.

Requirements of the IFC

• Additional requirements for fire safety during construction are contained in the IFC (now directly referenced in Section 3302.3 of the IBC)

Requirements of the IFC – Chapter 33

• Additional requirements for fire safety during construction are contained in the IFC. • Temporary heating equipment must be listed and labeled. • Smoking is prohibited except in approved areas with posted signage. • A fire watch must be maintained with qualified personnel if required by the fire code official.

Requirements of the IFC – Chapter 33

• Welding operations must follow the provisions of IFC Chapter 35. Electrical wiring must follow the provisions of NFPA 70 (IFC 3304). • The owner must designate a fire prevention superintendent responsible for implementing a fire prevention program during construction. • An accessible emergency phone must be provided in an approved location at the construction site.

Requirements of the IFC – Chapter 33

• Fire-fighting vehicle access must be provided within 100 feet of temporary or permanent fire department connections. • An approved water supply for fire protection must be available when combustible material is at the construction site. • Requirements for safeguards during roofing operations.

AWC Standards Referenced in the IBC

Chapter 23

IBC Chapter 23

• 2301 General • 2302 Definitions • 2303 Minimum Standards and Quality • 2304 General Construction Requirements • 2305 General Design Requirements for Lateral Force- resisting Systems • 2306 Allowable Stress Design • 2307 Load and Resistance Factor Design • 2308 Conventional Light-frame Construction

AWC Standards Referenced in the IBC

SDPWS

AWC Standards Referenced in the IBC

Wood Frame Construction Manual

Coming in 2015 IBC

• Slightly broader application of WFCM • Re-organization of Conventional Wood Frame Construction Provisions (2308) • Revised span tables based on new Southern Pine design values

136

Coming in the 2015 IBC

• Reformatted height and area provisions • Provisions for Cross Laminated Timber • New engineered wood rim board standard

137 Cross-laminated Timber

138 Some Advantages of CLT Panels

Source: FPInnovations

139 Stradthaus-Murray Grove Tower, London

• Completed 2009 • 8 over 1 - 29 apartments • Stores 186 tonnes of carbon • 5 people on site, worked only 3 days/week • Completed 49 weeks.

140 Cross-laminated Timber

141 Client Telford Homes PLC and Metropolitan Housing Trust Architect: Waugh Thistleton Architects Structural Engineer Techniker Main Contractor: Telford Homes Timber supplier and erector: KLH UK

142 10 stories

143 Canadian Projects –1st NA Multi-Family, Quebec

144 Changes to the 2012 IBC

145 Fire Test

ASTM E119 Fire Endurance Test • 5-Ply CLT (approx. 7” thick) • 5/8” Type X GWB each side • Sought 2 hour rating • RESULTS: 3 hours 6 minutes

146 Fire Test

American Wood Council ASTM E119 Fire Endurance Test • 5-Ply CLT (approx. 7” thick) • 5/8” Type X GWB each side • Sought 2 hour rating • RESULTS: 3 hours 6 minutes

http://www.awc.org/Code-Officials/2012-IBC-Challenges/#

147 Building Code - CLT

CLT – included in the 2015 IBC

148 Where is CLT Allowed in IBC 2015?

• Type IV Construction 602.4 Type IV. Type IV construction (Heavy Timber, HT) is that type of construction in which the exterior walls are of noncombustible materials and the interior building elements are of solid or laminated wood without concealed spaces. The details of Type IV construction shall comply with the provisions of this section. Fire retardant treated wood framing complying with Section 2303.2 shall be permitted within exterior wall assemblies with a 2-hour rating or less. Exterior walls complying with Section 602.4.1 or 602.4.2 shall also be permitted. Minimum solid sawn nominal dimensions are required for structures built using Type IV construction (HT). For glued-laminated members the equivalent net finished width and depths corresponding to the minimum nominal width and depths of solid sawn lumber are required as specified in Table 602.4. Cross laminated timber (CLT) dimensions used in this section are actual dimensions. 149 Where is CLT Allowed in IBC 2015?

Code modifications to Ch. 23 Wood

2303.1.4 Structural glued cross laminated timber. Cross-laminated timbers shall be manufactured and identified as required in ANSI/APA PRG 320-2011.

CROSS-LAMINATED TIMBER. A prefabricated engineered wood product consisting of at least three layers of solid-sawn lumber or structural composite lumber where the adjacent layers are cross-oriented and bonded with structural adhesive to form a solid wood element.

Code modifications to Ch. 35 Wood ANSI or APA ANSI/APA PRG 320-2011 Standard for Performance-Rated Cross- Laminated Timber

150 Where is CLT Allowed in IBC 2015?

151 Franklin Elementary School

Franklin, West Virginia Architect: MSES Architects, Fairmont, WV Source: LignaTerra

152 Franklin Elementary School

Franklin, West Virginia 46,200 sq. ft. 8 week assembly Source: LignaTerra 153 Franklin Elementary School

Source: LignaTerra

154 Franklin Elementary School

Scheduled completion date: Winter 2015

155 Recent Demonstration Fire Tests Recent Demonstration Fire Tests

Heat Release Rate Recent Demonstration Fire Tests

2500

F) °

2000

ASTM E119 Curve

1500

1000 Compartment Temperatures ( Temperatures Compartment

500

0 0 5 10 15 20 25 30 Time (Min) Compartment Temperature

A complete report and video presentation are available at: http://awc.org/Code-Officials/2015-IBC-Code-Changes Recent Demonstration Fire Tests

Room after 60 minutes

Room after drywall removed following the three-hour test CLT Test U.S. CLT Handbook

http://www.awc.org/standards/manuals.html 162 CLT Resources

http://www.awc.org/publications/download.php

163 Questions?

• This concludes The American Institute of Architects Continuing Education Systems Course

Michelle Kam-Biron, PE, SE, SECB American Wood Council [email protected]

164