bcd130 –2018 ibc and 2018 irc · 2021. 2. 25. · bcd130 –2018 ibc and irc wood changes 25...

2/14/2018

Copyright © 2018 American Wood Council1

BCD130 – 2018 IBC and 2018 IRC Significant Changes Related to Wood Construction

Sandra Hyde, P.E.Senior Staff EngineerInternational Code Council

Michelle Kam-Biron, P.E., S.E., S.E.C.BSenior Director, EducationAmerican Wood Council

James B. Smith, P.E.Midwest Regional ManagerAmerican Wood Council

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Participants may download the presentation here: http://www.awc.org/education/resources

The American Wood Council is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES), Provider # 50111237.

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 of handling, 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

Add description

The 2018 International Building Code (IBC) and 2018 International Residential Code (IRC) published by the International Code Council are now available. This presentation will provide an overview of the significant changes to wood design and construction provisions relative to the previous editions. This is a split format with the first hour devoted to the IBC and the second hour dwelling on the IRC.

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LEARNING OBJECTIVESUpon completion, participants will be:

Familiar with the significant changes between the 2015 and 2018 IBC for wood provisions.

Significant Changes

Able to locate and analyze content within the 2018 IBC wood provisions.

IBC Wood Provisions

Familiar with new 2018 IRC requirements regarding wood use.

IRC Wood Provisions

Able to explain and use fire protection requirements for wood within the IBC and IRC.

Fire Requirements

1 3

2 4

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5

POLLING QUESTION

1. What is your profession?

a) Architect

b) Engineer

c) Code Official

d) Builder/Product Manufacturer

e) Other

6

POLLING QUESTION

2. How often do you use the International Building Code (IBC)?

a) Every day.

b) Periodically a project references the IBC.

c) I have looked in it once or twice.

d) What is the IBC?

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B C D 1 3 0 – 2 0 1 8 I B C a n d I R C W o o d C h a n g e s 7

2018 IBC AND IRCSignificant Changes, Part 1

B C D 1 3 0 – 2 0 1 8 I B C an d I R C W o o d C h an g e s 8

IBC2018

• Exterior Balconies

• Special Inspection and Structural Observation

• Fire Retardant Treated Wood

• Fire Protection

• Heavy Timber & Mass Timber

• Construction Type

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B C D 1 3 0 – 2 0 1 8 I B C an d I R C W o o d C h an g e s 9

NAVIGATING THE IBC

B C D 1 3 0 – 2 0 1 8 I B C an d I R C W o o d C h an g e s 1 0

202 DEFINITIONS

Approved Agency• Conduct Tests• Furnish Inspection Services• Furnish Product Certification (New)

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FRT WOOD SHEATHING EXT. WALL ASSEMBLIES

602.3, 602.4.1• Fire-retardant-treated wood framing

and sheathing permitted within exterior walls of Type III and IV construction

• 2-hour rating or less

• Type IV - Minimum of 6 inches in thickness


COL. PROTECTION IN LIGHT-FRAME CONSTRUCTION

704.2, 704.4.1• Required fire-resistance rating

permitted to be provided with membrane protection

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COLUMNS WITHIN WALL ASSEMBLY

IBC 704.2 and 704.3 No additional fireproofing required for the column in the assembly


EXTENT OF PROJECTIONSTABLE 705.2• Minimum clearance measured to line used to determine fire separation distance

has been revised to be consistent with 2012 IBC

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EXTENT OF PROJECTIONS


705.2.3, 705.2.3.1, 705.2.4• Provisions relocated from Section 1406

(Combustible Materials on the Exterior Side of Exterior Walls)

• Plastic composites now permitted to be installed in guard components where untreated wood allowed

COMBUSTIBLE BALCONIES, PROJECTIONS, AND BAY WINDOWS

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706.2• Applicable only in SDCs D, E and F

• Allows for continuous diaphragm for floor and/or roof assembly

• Also stabilizes double fire walls to resist impact during seismic event

STRUCTURAL CONTINUITY OF DOUBLE FIRE WALLS


STRUCTURAL CONTINUITY OF DOUBLE FIRE WALLS

Graphics: WoodWorks

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803.1.1, 803.1.2• Criteria reorganized by:

• Initially addressing allowance for compliance with NFPA 286 for all applications

• Followed by testing under ASTM E84 and UL 723

• Then other methods identified for special conditions such as textile coverings

INTERIOR WALL AND CEILING FINISH TESTING


803.3• Now applicable to interior exit

stairways, interior exit ramps and exit passageways

INT. FINISH REQUIREMENTS FOR HT MEMBERS

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803.12• Addresses flame spread testing

for:

• Factory-produced laminated products over a wood substrate

• Facings and wood veneers applied over a wood substrate on site

FLAME SPREAD TESTING OF LAMINATES & VENEERS


TABLE 1607.1Deck live load

= 1.5 x room live load

< 100 psf

DECK LIVE LOADS

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1615• New section and definitions

address tsunami-resistant design of critical infrastructure and essential facilities

• Applicable to Risk Category III and IV structures located in Tsunami Design Zones

TSUNAMI LOADS


1704.6.1 1704.6.2 & 1704.6.3• Clarifies and consolidates requirements for structural observation for both

seismic and wind into 1704.6.1

• Modifies the wind trigger from structural observation from 110 mph to 130 mph for Risk Categories III or IV

STRUCTURAL OBSERVATION

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1705.11.1 Structural wood• Clarifies the main wind force-resisting system fastening exception to special

inspection in wood frame construction (based on nail spacing for sheathing exceeding 4 inches on center) at the panel edges.

SPECIAL INSPECTION


POLLING QUESTION

3. Which of the following is NOT true for floor sheathing at light‐frame double fire walls? It may be:

a) 1” thick.

b) Continuous thru fire walls in SDC E‐F

c) Continuous thru fire walls in high wind zones & SDC D.

d) Answers b) and c)

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Chapter 23WOOD


• 2018 National Design Specification(NDS) for Wood Construction

• 2018 Wood Frame Construction Manual for One-and-Two Family Dwellings (WFCM)

• ANSI 117-2015 Standard Specification for Structured Glued Laminated Timber of Softwood Species

REFERENCED STANDARDS

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• ANSI A190.1-2017 Structural Glued Laminated Timber

• ANSI/APA PRG-320-2017 Standard for Performance-Rated Cross-Laminated Timber

• ANSI/APA PRP 210-2014 Standard for Performance-Rated Engineered Wood Siding

• ANSI/APA PRR 410-2016 Standard for Performance-Rated Engineered Wood Rim Boards

REFERENCED STANDARDS


2303.2.2• Engineered lumber of FRT

wood to be impregnated with chemicals

• Paints, coating, stains and other surface treatments not an approved method

FIRE-RETARDANT-TREATED WOOD

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TABLE 2304.9.3.2• New alternative fastener

schedule for construction of mechanically laminated decking [also called Nail Laminated Timber (NLT)]

• Provides for equivalency where power-driven fasteners are used instead of 20d nails

MECHANICALLY LAMINATED DECKING

Architect: Profeta Royalty ArchitectureStructural Engineer: Structural FocusCompleted: 2011



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TABLE 2304.10.1• 8d common and ring shank

nails now addressed for fastening of roof sheathing when nailing 6 inches or 12 inches on center

• Provides for alignment of 2018 IBC and IRC

RING SHANK NAILS

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RING SHANK NAILS


HEAVY-TIMBER CONSTRUCTION

2304.11• Heavy timber provisions of

Chapter 23 have been reorganized

• Table on engineered lumber dimensional equivalencies relocated from Section 602.4

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HEAVY-TIMBER CONSTRUCTION


2304.12.2.5, 2304.12.2.6SUPPORTING MEMBERS FOR PERMEABLE FLOORS AND ROOFS

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SUPPORTING MEMBERS FOR PERMEABLE FLOORS AND ROOFSIBC & IEBC CH. 1

• Details in construction documents and inspections for impervious moisture barriers used in exterior balconies.


2304.12.2.5, 2304.12.2.6

• Where an impervious moisture barrier system is used to protect the wood structure supporting moisture-permeable floors, positive drainage shall be provided for water that infiltrates the moisture-permeable floor topping

SUPPORTING MEMBERS FOR PERMEABLE FLOORS AND ROOFS

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HEADER AND GIRDER SPANS – EXTERIOR WALLS


HEADER AND GIRDER SPANS – EXTERIOR WALLS

TABLE 2308.4.1.1 (1)

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HEADER AND GIRDER SPANS – INTERIOR WALLS


2308.5.5.1• Single member headers now

permitted in Section 2308• Typically limited to spans of

2-4 ft, Table 2308.4.1.1(1)• Increases energy efficiency by

allowing for a greater thickness of cavity insulation

OPENINGS IN EXTERIOR BEARING WALLS

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ASCE 7-16Changes


• General reference to ASCE 7 references 2016 edition in Chapter 35

• IBC wind and seismic load provisions agree with updated criteria in ASCE 7-16

• References in Chapter 18 seismic provisions to coordinate with ASCE 7-16

ASCE 7-16 CHANGES

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IBC allows three paths to determine snow load:

1. Use the IBC to determine snow loads (Figure 1608.2 or Table 1608.2 for Alaska)

2. Use new ASCE 7 tables for the western US and New Hampshire.

3. Reference state produced maps which have greater detail for the western US and New Hampshire.

ASCE 7-16 CHANGES


• Requirements for secondary drains –rain loads • ASCE 7-16 bases minimum requirements

on a 15 min/100-yr event.

• IBC still uses the 1 hr/100-yr event for both primary and secondary minimum drain flow.

ASCE 7-16 CHANGES

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POLLING QUESTION

4. Exterior balconies w/ an impervious moisture barrier system over wood structure supporting moisture‐permeable floors shall have:

a) Positive draining of water

b) Ventilation below the floor system

c) Details in construction documents

d) Inspections for impervious moisture barriers

e) All of the above.


RESOURCES

http://www.awc.org/pdf/codes-standards/publications/archives/StructureMag-CodesStandards_ReprintWithAppendix-Tyree-1801.pdf

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RESOURCES


RESOURCES

https://buildingscience.com/documents/building-science-insights-newsletters/bsi-093-all-decked-out

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MORE INFO???

http://awc.org/codes-standards/publications


RESOURCES

E-courses

2018 NDS Changes - National Design Specification®

for Wood Construction (STD120)

2018 WFCM Changes - Wood Frame Construction Manual for One- and Two-Family Dwellings (STD350)

http://awc.org/education/ecourses

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2018 Significant Changes to the International Building Code

RESOURCES


Significant Changes to the Provisions of ASCE 7-16

RESOURCES

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T h i s p r e s e n t a t i o n i s p r o t e c t e d b y U S a n d I n t e r n a t i o n a l C o p y r i g h t l a w s . R e p r o d u c t i o n , d i s t r i b u t i o n , d i s p l a y a n d u s e o f t h e p r e s e n t a t i o n w i t h o u t w r i t t e n p e r m i s s i o n o f A m e r i c a n W o o d C o u n c i l ( A W C ) i s

p r o h i b i t e d . © A m e r i c a n W o o d C o u n c i l 2 0 1 7

in [email protected] | www.awc.org

This concludes the American Institute of Architects Continuing Education Systems Course

BCD130– 2018 IBC and 2018 IRC Significant Changes Related to Wood Construction

Sandra Hyde, P.E.Senior Staff EngineerInternational Code Council

Michelle Kam-Biron, P.E., S.E., S.E.C.BSenior Director, EducationAmerican Wood Council

James B. Smith, P.E.Midwest Regional ManagerAmerican Wood Council

2/14/2018


5 9B C D 1 3 0 – 2 0 1 8 I B C an d I R C W o o d C h an g e s

2018 IRC

Significant Changes, Part 2


We will cover changes in the 2018 IRC involving:

Updated reference standards

Fasteners and framing changes

Fire resistance

Decks

Wall coverings and roofs

INTRODUCTION - IRC

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POLLING QUESTION

5. How often do you use the International Residential Code (IRC)?

a) Every day.

b) Periodically a project references the IRC.

c) I have looked in it once or twice.

d) What is the IRC?


UPDATED REFERENCE STANDARDS

2018 NDS - National Design Specificationfor Wood Construction 2018 WFCM - Wood Frame Construction Manual for One-and-Two Family Dwellings ANSI 117-2015 Standard Specification for Structured Glued Laminated Timber of Softwood Species (APA)

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ANSI A190.1-2017 Structural Glued Laminated Timber ANSI/APA PRG-320-2017 Standard for Performance-Rated Cross-Laminated TimberANSI/APA PRP 210-2014 Standard for Performance-Rated Engineered Wood SidingANSI/APA PRR 410-2016 Standard for Performance-Rated Engineered Wood Rim Boards

UPDATED REFERENCE STANDARDS


APPROVED AGENCY

An established and recognized agency that is regularly engaged in conducting tests, furnishing inspection services or furnishing product certification, and has been approved by the building official

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Ring shank nails

12-ft tall walls

Headers

Ceiling joists

FASTENERS AND FRAMING


FASTENING SCHEDULE

Item Building Element Number and Type of Fastener Spacing and Location

13 Double top plate splice8-16d common (3½" × 0.162") 12-16d box (3½" × 0.135") 12-10d box (3" × 0.128")12-3" × 0.131" nails

Face nail on each side of end joint (minimum 24" lap splice length each side of end joint)

29 Bridging or blocking to joist

2-10d box (3" × 0.128") 2-8d common (2½" × 0.131") 2-3" × 0.131" nails

Each end, toe nail

TABLE R602.3(1)

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FASTENING SCHEDULE

Item Building Element Number and Type of Fastener

SpacingEdge Interm.

30 ⅜″ - ½″6d common (2" × 0.113") nail (subfloor, wall)8d common (2½″ × 0.131") nail (roof)RSRS-01 (2⅜" × 0.113") nail (roof)

6 12f

31 19/32″ - 1″ 8d common nail (2½″ × 0.131")RSRS-01 (2⅜" × 0.113") nail (roof) 6 12f

32 1⅛″ - 1¼″ 10d common (3" × 0.148") nail8d (2½″ × 0.131") deformed nail 6 12

f. For WSP roof sheathing attached to gable end roof framing and to intermediate supports within 48 in. of roof edges and ridges, nails spaced at 6 inches o.c. where the Vult < 130 mph and shall be spaced 4 inches o.c. where the Vult > 130 mph but < 140 mph.

j. RSRS-01 is a Roof Sheathing Ring Shank nail meeting the specifications in ASTM F1667.

TABLE R602.3(1)


FASTENING SCHEDULE

f. Where the ultimate design wind speed is 130 mph or less, nails for attaching wood structural panel roof sheathing to gable end wall framing shall be spaced 6 inches on center. Where the ultimate design wind speed is greater than 130 mph, nails for attaching panel roof sheathing to intermediate supports shall be spaced 6 inches on center for minimum 48-inch distance from ridges, eaves and gable end walls; and 4 inches on center to gable end wall framing.

f. For wood structural panel roof sheathing attached to gable end roof framing and to intermediate supports within 48 inches of roof edges and ridges, nails shall be spaced at 6 inches on center where the ultimate design wind speed is less than 130 mph and shall be spaced 4 inches on center where the ultimate design wind speed is 130 mph or greater but less than 140 mph.

TABLE R602.3(1)

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POLLING QUESTION

6. Can wood stud walls be 12 feet tall using the IRC?a) Yes, the wall bracing section allows walls up to 12 feet tall.

b) No, the maximum story height is 11 feet 7 inches.

c) No, a wall 12 feet tall requires engineering.

d) All of the above.


TABLE R602.3(6)

Snow load ≤ 30 psf, Exposure B, #2 lumber

ALTERNATE STUD HEIGHTS

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Wall studs ≤ 16" o.c. Minimum ½-inch gypsum board on the interior and ⅜-inch wood structural panel sheathing on the exterior Minimum 8d (2.5" x 0.131") nails at ≤ 6" o.c. along panel

edges, 12" o.c. at intermediate supports Panel joints shall occur over studs or blocking Vult > 115 mph, studs attached to top and bottom plates

with connector having minimum 300-pound lateral capacity

Maximum span applies to single- and multiple-span roof and floor conditions

The roof assembly shall not contain a habitable attic

TABLE R602.3(6) FOOTNOTES

ALTERNATE STUD HEIGHTS


GIRDERS/HEADERS EXTERIOR WALLSTable R602.7(1) Girder Spans and Header Spans for Exterior Bearing Walls

(Maximum spans for DFL, HF, SP, and SPF and required number of jack studs)

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GIRDERS/HEADERS INTERIOR WALLSTable R602.7(2) Girder Spans and Header Spans for Interior Bearing Walls

(Maximum spans for DFL, HF, SP, and SPF and required number of jack studs)


POLLING QUESTION

7. What is the difference between rim board and 2x headers?

a) Rim board is a 2x stick of lumber.

b) Rim board tends to be less than 2‐inch nominal in thickness.

c) Rim board is a manufacturer’s name.

d) What is rim board?

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Slight changes

RIM BOARD HEADER CONSTRUCTION

Figure R602.7.2


SUPPORT FOR HEADERS

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SEISMIC ADJUSTMENT FACTORSTABLE R602.10.3(4)


TABLE R602.10.4

Material Minimum Thickness

Connection Criteria

Fasteners SpacingSFB -Structural

fiberboardsheathing

½" or 25/32" for maximum 16" stud spacing

1½" long × 0.12" dia. (for½" thick sheathing) 1¾" long × 0.12" dia. (for 25/32" thick sheathing) galvanized roofing nailsor 8d common (2½" long ×0.131" dia.) nails

3" edges, 6" field

METHOD STRUCTURAL FIBERBOARD

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Section R502.6 Joists with insufficient bearing on concrete or masonry could use a joist hanger

BEARING


ROOF FRAMINGR802.2 Design and construction

R802.3 Ridge

R802.4 Rafters

R802.4.1 Rafter size

R802.4.2 Framing details

R802.4.3 Hips and valleys

R802.4.4 Rafter supports

R802.4.5 Purlins

R802.4.6 Collar ties

R802.5 Ceiling joists

R802.5.1 Ceiling joist size

R802.5.2 Ceiling joist and rafter connection

R802.5.2.1 Ceiling joists lapped

R802.5.2.2 Rafter ties

R802.5.2.3 Blocking

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Section R802.5.2.1… Wood structural panel roof sheathing, in accordance with Table R503.2.1.1(1), shall not cantilever more than 9 inches beyond the gable endwall unless supported by gable overhang framing.

CEILING JOISTS LAPPED


SOFFIT INSTALLATIONR703.3.1.1 Wood structural panel soffit.

Minimum ⅜ in. thick

Fastened to framing or nailing strips with 2-inch by 0.099-in. nails

Spaced not less than 6 in. o.c. at panel edges and 12 in. o.c. at intermediate supports.

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VINYL SIDING INSTALLATIONR 7 0 3 . 1 1 . 2 V I N Y L S I D I N G I N S T A L L A T I O N O V E R F O A M P L A S T I C S H E A T H I N G


Fire ResistanceInterior - required for duplexes, triplexes and townhomes

Exterior – near lot lines

FIRE RESISTANCE

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EXTERIOR WALLS


R302.2 Options!

TOWNHOUSE SEPARATION

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R302.13 Expansion of requirements to electric furnaces and water heaters

FIRE PROTECTION OF FLOORS


DecksMany updates and a reorganized section!

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POLLING QUESTION

8. Are you familiar with DCA 6 – AWC’s Deck Construction Guide?

a) Yes. I use it periodically.

b) Yes. I have looked through its requirements.

c) I think I thumbed through one once.

d) Nope. What is that?


R507 Decks

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R507Decks


DECK MATERIALS

R507.2.1 Wood materials

R507.2.1.1 Engineered wood products

R507.2.2 Plastic composites

R507.2.2.1 Labeling

R507.2.2.2 Flame spread index

R507.2.2.3 Decay resistance

R507.2.2.4 Termite resistance

R507.2.2.5 Installation of plastic composite

R507.2.3 Fasteners and connectors

R507.2.4 Flashing

R507.2.5 Alternate materials

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FASTENER AND CONNECTOR SPECIFICATIONS

a. Equivalent materials, coatings and finishes shall be permitted.b. Fasteners and connectors exposed to salt water or located within 300 feet of a salt water shoreline shall be stainless steel.c. Holes for bolts shall be drilled a minimum 1/32" and a maximum 1/16" larger than the bolt.d. Lag screws ½" and larger shall be predrilled to avoid wood splitting per National Design Specification (NDS) for Wood

Construction.e. Stainless steel driven fasteners shall be in accordance with ASTM F 1667.

Item Material Minimum Finish/Coating Alternate Finish/Coatinge

Nails and timber rivets ASTM F1667 Hot-dipped galvanized per ASTM A153 Stainless steel, silicon

bronze or copper

Boltsc

Lag screwsd

ASTM A307 (bolts), ASTM A563 (nuts), ASTM F844 (washers)

Hot-dipped galvanized per ASTM A153, Class C (Class D for ⅜-inch diameter and less) or Mechanically galvanized per ASTM B695, Class 55 or 410 stainless steel

Stainless steel, silicon bronze or copper

Metal connectors

Per manufacturer’s specification

ASTM A653 type G185 zinc coated galvanized steel or Post hot-dipped galvanized per ASTM A123 providing a minimum average coating weight of 2.0 oz./ft2 (total both sides)

Stainless steel

TABLE R507.3


MINIMUM FOOTING SIZETABLE R507.3

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MINIMUM FOOTING SIZE


POST HEIGHTTABLE R507.4

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BEAM SPAN LENGTH

g. Beam cantilevers are limited to adjacent beam’s span divided by 4.

TABLE R507.5


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R507.5BeamsNotched post connection

BEAMS

1 0 0B C D 1 3 0 – 2 0 1 8 I B C an d I R C W o o d C h an g e s

R507.6JoistsNote the cantilever column

JOISTS

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JOISTS


VERTICAL SUPPORT

R507.9.1.4 Alternate ledger details.

Alternate framing configurations supporting a ledger shall be permitted. Must carry the standard loads required in R301.5.

In general, provisions for lateral connections were clarified.

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DECK ATTACHMENT FOR LATERAL LOADSFigure R507.9.2(2)


R610SIPs

STRUCTURAL INSULATED PANELS

Now reference ANSI/APA PRS 610.1, Standard for Performance-Rated Structural Insulated Panels in Wall Applications

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BUILDING THERMAL ENVELOPE

N1102.1 Building Thermal Envelope for Log Homes


Appendix QTiny HousesNew appendix section

Tiny house 400 ft2 or less

TINY HOUSES

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RESOURCES

2018 IRC article will be available in the March issue of Structure Magazine


RESOURCES

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2018 Significant Changes to the International Residential Code

RESOURCES


POLLING QUESTION

9. Have you taken a wood design course in college?

a) Yes.

b) No.

2/14/2018


T h i s p r e s e n t a t i o n i s p r o t e c t e d b y U S a n d I n t e r n a t i o n a l C o p y r i g h t l a w s . R e p r o d u c t i o n , d i s t r i b u t i o n , d i s p l a y a n d u s e o f t h e p r e s e n t a t i o n w i t h o u t w r i t t e n p e r m i s s i o n o f A m e r i c a n W o o d C o u n c i l ( A W C ) i s

p r o h i b i t e d . © A m e r i c a n W o o d C o u n c i l 2 0 1 7

in [email protected] | www.awc.org

This concludes the American Institute of Architects Continuing Education Systems Course

bcd130 –2018 ibc and 2018 irc · 2021. 2. 25. · bcd130 –2018 ibc and irc wood changes 25...

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