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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.
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.
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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.
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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
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
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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?
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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
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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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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)
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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.
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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
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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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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
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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
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
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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