structures + buiLdings
The 2018Wood Frame Construction Manual for One- and Two-Family Dwellings standard was developed by the AmericanWood Council’sWood Design Standards Committee.
What the 2018 IBC means for wood construction: Part 2
American Wood Council releases 2018 Wood Frame Construction Manual. By: Brad Douglas, P.E.
Figure 1: Rake overhang limits – Lookout blocks
Ongoing development in high-wind and high-seismic areas increases the number of buildings exposed to extreme conditions. The construction industry must play an active role in enhancing resiliency, especially in these high-risk areas. Fortunately, tools and resources available today better enable planning and mitigation of such conditions, which has led to continuous building code improvements and updated performance criteria to make communities safer and more resilient. With technological advances and material innovations regularly af- fecting the use of wood products, the American Wood Council (AWC) is committed to ensuring these changes are accurately reflected in code-referenced design standards and properly implemented by in- dustry professionals. The first article in this two-part series (Civil + Structural Engineer, March 2018, page 33; https://csengineermag.com/ article/2018-ibc-means-wood-construction-part) outlined changes made to the 2018 National Design Specification (NDS) for Wood Construction referenced in the International Code Council’s 2018 In- ternational Building Code (IBC). This article examines changes made to the 2018 Wood Frame Construction Manual (WFCM) for One- and Two-Family Dwellings standard, which is available online at www. awc.org/codes-standards/publications/wfcm-2018. The 2018 WFCM was developed by AWC’s Wood Design Standards Committee and is referenced in the IBC and the 2018 International Residential Code (IRC). The publication offers both practical guidance and technical detail, covering wood design and construction provisions for connections, wall systems, floor systems, and roof systems for one-
Figure 2: Rake overhang limits – Outlookers
and two-family dwellings, as well as a range of structural elements such as sawn lumber, structural glued laminated timber (glulam), wood structural sheathing, I-joists, and trusses. Framing members attached with properly designed fasteners and con- nectors help to resist forces associated with high wind and seismic events, as do diaphragms and shear walls made from wood structural panels properly attached to wall and roof framing. With this in mind, the 2018 WFCM equips designers and code officials with engineered and prescriptive construction methods that result in more resilient wood buildings better able to withstand forces associated with extreme natural disasters.
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may 2018
csengineermag.com
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