2012 IBC Review of Height and Area Opportunities for Light ...€¦ · 2012 IBC Review of Height and Area Opportunities for Light-Frame and CLT Michelle Kam-Biron, P.E., S.E., SECB

2012 IBC Review of Height and Area Opportunities for Light-Frame and CLT

Michelle Kam-Biron, P.E., S.E., SECB Director of Education

American Wood Council

•  2012 IBC Heights and Areas

•  Type III, IV, and V Construction

•  Height and Area Increases

•  Examples

•  2015 IBC inclusion of CLT

•  Examples Type IV via 2012 IBC

Outline

2012 International Building Code

Governing Code

Table 503 Excerpt - Allowable H&A p. 8

Group!

Height (ft)!

Type of Construction!Type III! Type IV! Type V!

A 65!

B 55!

HT 65!

A 50!

B 40!

Stories (S)!Area (A)!

A-3! S! 3! 2! 3! 2! 1!A! 14,000! 9,500! 15,000! 11,500! 6,000!

B! S! 5! 3! 5! 3! 2!A! 28,500! 19,000! 36,000! 18,000! 9,000!

E!S! 3! 2! 3! 1! 1!A! 23,500! 14,500! 25,500! 18,500! 9,500!

M!S! 4! 2! 4! 3! 1!A! 18,500! 12,500! 20,500! 14,000! 9,000!

R%1!S! 4! 4 ! 4 ! 3 ! 2 !A! 24,000! 16,000! 20,500! 12,000! 7,000!

R-2! S! 4! 4! 4! 3! 2!A! 24,000! 16,000! 20,000! 12,000! 7,000!

S-1! S! 3! 2! 4! 3! 1!A! 26,000! 17,500! 25,500! 14,000! 9,000!

Table 503 Excerpt - Allowable H&A

Group

Height (ft)

Type of Construction Type II Type III Type IV Type V

A 65

B 55

A 65

B 55

HT 65

A 50

B 40

Stories (S) Area (A)

A-3! S! 3! 2! 3! 2! 3! 2! 1!A! 15,500! 8,500! 14,000! 9,500! 15,000! 11,500! 6,000!

B! S! 5! 3! 5! 3! 5! 3! 2!A! 37,500! 23,000! 28,500! 19,000! 36,000! 18,000! 9,000!

E! S! 3! 2! 3! 2! 3! 1! 1!A! 26,500! 14,500! 23,500! 14,500! 25,500! 18,500! 9,500!

M!S! 4! 2! 4! 2! 4! 3! 1!A! 21,500! 12,500! 18,500! 12,500! 20,500! 14,000! 9,000!

R-1! S! 4! 4 ! 4! 4 ! 4 ! 3 ! 2 !A! 24,000! 16,000! 24,000! 16,000! 20,500! 12,000! 7,000!

R-2! S! 4! 4! 4! 4! 4! 3! 2!A! 24,000! 16,000! 24,000! 16,000! 20,000! 12,000! 7,000!

S-1! S! 3! 2! 3! 2! 4! 3! 1!A! 26,000! 17,500! 26,000! 17,500! 25,500! 14,000! 9,000!

Exception p. 12

!  Section 504.2 permits increased building heights

•  20 feet

•  1 story above grade.

NFPA 13

Height Increases for Sprinklers

Table 503 limit

+ 1 story and 20 ft.

Section 506 Building Area Modification

Aa = At + [At x If] + [At x Is] !  Aa = Allowable area per story

!  At = Tabular area per story

!  If = Area increase factor due to frontage

!  Is = Area increase factor due to sprinkler protection

Area Increases p. 9

Code Conforming Wood Design

•  Now using CCWD tables . . .

Group B – NFPA 13 Sprinklered p.31

Group R - NFPA 13 Sprinklered p. 43

Project Team:

•  Owner: City of Galt and CFY Development Inc.

•  General Contractor: CFY Development Inc.

•  Architect: Michael F. Malinowski, AIA, Applied Architecture Inc.

•  Structural Engineer: Mike Baker, SE, Baker Guptil Structural Designs, Inc.

•  Framer: Becker General Contractors

•  Construction Timeline:

•  March 2011 to occupancy in June 2012

Mixed Use – Galt

Mixed Use – Galt

•  Architectural Components •  Construction Type: VA •  Areas & Occupancies:

•  Level 1: S-2 (24,633 sf) Enclosed, A2, M and B – Retail/Restaurant/Office and Residential Administration (14,356 sf)

•  Levels 2 and 3: R-2– 88 Units (62,480 sf) •  Sprinklers: NFPA 13 sprinkler system

Appr

ox. 4

7’

S-2 Enclosed, A2, M & B

R-2

R-2

Mixed Use – Galt

Mixed Use

Project Team:

•  Owner: TDI California Construction & Oceano Partners

•  General Contractor: TDI California Construction

•  Architect: RC Alley III, NCARB, Architects Orange

•  Structural Engineer: Tom VanDorpe, SE, VanDorpe Chou Associates, Inc. (VCA)

•  Framer: Brian Larrabure, Larrabure Framing

Construction Timeline: January 2011 to occupancy in July 2012

Oceano at Warner Center

Oceano at Warner Center

• Architectural Components •  Construction Type: VA •  Occupancies:

•  Below Grade: S-2 Enclosed semi-subterranean parking below grade

•  Levels 1-4: R-2 Building 1 – 116 units (146,847 sf) and Building 2 –128 units (163,468 sf)

•  Sprinklers: NFPA 13 sprinkler system

Appr

ox. 5

5’

S-2 Enclosed

R-2

R-2

R-2

R-2

Oceano at Warner Center

Oceano at Warner Center

2015 International Building Code

Building Code

2015 IBC

•  ASTM E119 Fire Endurance Test

• 5-Ply CLT (~7” thick) • 5/8” Type X GWB each side • 3 hours 6 minutes • www.awc.org/Code-Officials/

2012-IBC-Challenges/

2015 IBC

2015 IBC

•  ANSI/APA PRG 320-2011 Standard for Performance-Rated Cross-Laminated Timber

2015 NDS

2015 National Design Specification for Wood Construction

•  CLT Provisions

• 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

2015 IBC

2015 IBC

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.

2015 IBC

Type IV Construction – Exterior Walls

602.4.1 Fire-retardant-treated wood framing complying with Section 2303.2 shall be permitted within exterior wall assemblies with a 2-hour rating or less. 602.4.2 Cross-laminated timber complying with Section 2303.1.4 shall be permitted within exterior wall assemblies with a 2-hour rating or less provided: •  Exterior surface of the cross-laminated timber is protected fire retardant

treated wood sheathing complying with 2303.2 and not less than 15/32 inch thick;

OR •  gypsum board not less than ½ inch thick; OR •  a noncombustible material.

IBC

" Type IV Construction – Floors

602.4.6.2 CLT. Cross laminated timber shall be not less than 4 inches (102 mm) in thickness. It shall be continuous from support to support and mechanically fastened to one another. Cross laminated timber shall be permitted to be connected to walls without a shrinkage gap providing swelling or shrinking is considered in the design. Corbelling of masonry walls under the floor shall be permitted to be used.

2015 IBC

" Type IV Construction – Roofs

602.4.5 602.4.7 Roofs. Roofs shall be without concealed spaces and wood roof decks shall be sawn or glued laminated, splined or tongue-and-groove plank, not less than 2 inches (51 mm) nominal in thickness,; 11/8-inch-thick (32 mm) wood structural panel (exterior glue), or of; planks not less than 3 inches (76 mm) nominal in width, set on edge close together and laid as required for floors.; or of cross laminated timber. Other types of decking shall be permitted to be used if providing equivalent fire resistance and structural properties Cross laminated timber roofs shall be not less than 3 inch nominal in thickness and shall be continuous from support to support and mechanically fastened to one another.

2015 IBC

" Type IV Construction – Interior Walls & Partitions

602.4.8.1 Interior Walls and Partitions. Interior walls and partitions shall be of solid wood construction formed by not less than two layers of 1-inch (25 mm) matched boards or laminated construction 4 inches (102 mm) thick, or of 1-hour fire-resistance-rated construction. 602.4.8.2 Exterior walls. All exterior walls shall be of one of the following: 1. Noncombustible materials; or 2. Not less than 6 inches in thickness and constructed of one of the following: 2.1 Fire retardant treated wood in accordance with 2303.2 and complying with 602.4.1 or 2.2. Cross laminated timber complying with 602.4.2.

2015 IBC – Type IV

IBC 2012 - Table 503 Excerpt - Allowable H&A

Group

Height (ft)

Type of Construction Type II Type IV

A 65

B 55

HT 65

Stories (S) Area (A)

A-3! S! 3! 2! 3!A! 15,500! 8,500! 15,000!

B! S! 5! 3! 5!A! 37,500! 23,000! 36,000!

E! S! 3! 2! 3!A! 26,500! 14,500! 25,500!

M!S! 4! 2! 4!A! 21,500! 12,500! 20,500!

R-1! S! 4! 4 ! 4 !A! 24,000! 16,000! 20,500!

R-2! S! 4! 4! 4!A! 24,000! 16,000! 20,000!

S-1! S! 3! 2! 4!A! 26,000! 17,500! 25,500!

IBC 2012 – HT w/ Sprinklers and Open Frontage

Group Height (ft)

Type of Construction Type II Type IV Type IVa,b,c

A 65

B 55

HT 65

HT 85

Stories (S) Area (A)

A-3! S! 3! 2! 3! 4!A! 15,500! 8,500! 15,000! 42,180!

B! S! 5! 3! 5! 6!A! 37,500! 23,000! 36,000! 67,500!

E! S! 3! 2! 3! 4!A! 26,500! 14,500! 25,500! 71,710!

M!S! 4! 2! 43! 5!A! 21,500! 12,500! 20,500! 46,120!

R-1! S! 4! 4 ! 4 ! 5!A! 24,000! 16,000! 20,500! 46,120!

R-2! S! 4! 4! 4! 5!A! 24,000! 16,000! 20,000! 46,120!

S-1! S! 3! 2! 4! 5!A! 26,000! 17,500! 25,500! 40,420!

•  NFPA 13 sprinklers •  30’ open frontage all around

IBC 2015 – Type IV Fire-Resistance Requirements

IBC 2015 – Type IV Fire-Resistance Requirements

Franklin Elementary School

Franklin, West Virginia 46,200 sq. ft. 8 week assembly

Source: LignaTerra

Franklin Elementary School

Source: LignaTerra

Franklin Elementary School

Scheduled completion: Winter 2015

2015 IBC

•  Revise 510 levels above grade

SECTION 510 SPECIAL PROVISIONS 510.2 Horizontal building separation allowance. A building shall be considered as separate and distinct buildings for the purpose of determining area limitations, continuity of fire walls, limitation of number of stories and type of construction where all of the following conditions are met: 1. The buildings are separated with a horizontal assembly having a fire-resistance rating of not less than 3 hours. 2. The building below the horizontal assembly is not greater than one story above grade plane.

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

Closed Parking Garage – 1st floor

Residential Occupancy – floors 2 thru 6

Grade Plane

6 stories 80 ft max

Upper Building Height – 4-5 stories

NFPA 13 Sprinklers

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

Parking Garage – 1st & 2nd floor

Residential Occupancy – floors 2 thru 6

Grade Plane

6 stories 80 ft max

Upper Building Height – 4-5 stories

NFPA 13 Sprinklers

Code Conforming Wood Design

Available free

www.awc.org

www.awc.org

[email protected]

Questions?