![]() This excerpt from 2015 WFCM Table 3.22A1 provides consistency with International Building Code (IBC) and International Residential Code (IRC) live load deflection criteria for certain headers.Īs per IBC 2309.1, Wood Frame Construction Manual: Importantly, new language in IBC 2309 allows for use of the WFCM for non-residential structures within its scoping limitations. ![]() Tables are now based on L/240 instead of L/360 to be consistent with deflection limits for members supporting roofs and ceilings as shown in IRC Table R802.5.1 and IBC Table 2308.7.2 for rafters with ceilings attached to rafters, and IRC Table R802.4 and IBC Table 2308.7.2 for ceiling joists, respectively. Flexible finishes are denoted as “(including gypsum board)” and brittle finishes are denoted as “(including plaster and stucco).”įinally, roof header spans were revised in the 2015 WFCM to reflect L/240 live load deflection limits for members supporting only a roof and ceiling as shown in 2015 IRC and IBC tables. ![]() New tables for ceiling joist spans/capacities, rafter spans/capacities, and hip and valley beam capacity requirements have also been revised in the 2015 WFCM to clarify the live load deflection criteria and to associate live load deflection limits to cases with “no ceiling attached” and ceilings with “flexible finishes” and “brittle finishes.” Tables are added to address deflection criteria of L/LL=360 for brittle finishes (see example of Table 3.25B2). The American Lumber Standard Committee (ALSC) Board of Review approved changes to these design values for all grades and sizes of visually graded Southern pine and mixed Southern pine lumber with a recommended effective date of June 1, 2013. Notably, the 2015 NDS Supplement incorporates new design values for visually-graded Southern pine. Tabulated spans for lumber framing members reflect changes to design values referenced in the 2015 NDS Supplement: Design Values for Wood Construction. You May Also Like French hotel combines nature and architecture This is an excerpt of 2015 WFCM Table 3.25B2 which helps clarify live load deflection criteria for different ceiling finishes. 117 to 313 km/h (110 to 195 mph) 700-year return-period, three-second gust basic wind speeds and.0 to 3.35 kPa (0 to 70) psf ground snow loads.Tabulated engineered and prescriptive design provisions in WFCM chapters two and three, respectively, are based on the following loads from American Society of Civil Engineers (ASCE) 7-10, Minimum Design Loads for Buildings and Other Structures: revised header spans to reflect L/240 live load deflection limits for members supporting only a roof and ceiling as shown in 2015 IRC and IBC tables.new tables to provide prescriptive wood-frame solutions for rafters and ceiling joists in response to new live load deflection limits for ceilings using flexible finishes (including gypsum wallboard) or brittle finishes (including plaster and stucco) as adopted in the 2015 IRC and.updated design values for visual grades of Southern Pine reflected in tabulated spans for lumber framing members as referenced in the 2015 NDS Supplement: Design Values for Wood Construction.Primary changes reflected in the 2015 edition of the WFCM standard include: A range of structural elements are covered, including sawn lumber, structural glued-laminated (glulam) timber, wood structural panel sheathing, I-joists, and trusses. The WFCM includes design and construction provisions for high wind, seismic, and snow loads for connections, wall systems, floor systems, and roof systems. ![]() This month, the 2015 edition of the ANSI/AWC Wood Frame Construction Manual ( WFCM) for One- and Two-Family Dwellings will be explored to provide guidance for wood-frame construction in residential as well as commercial structures that fit within its scoping. The 2015 edition of the Wood Frame Construction Manual ( WFCM) for One- and Two-Family Dwellings provides guidance for wood-frame construction in residential as well as certain commercial structures. These standards primarily govern engineering design and construction of wood structures to resist all applicable loads including high wind and seismic forces. Over the last two months, this author has covered updates to the 2015 National Design Specification ( NDS) for Wood Construction and 2015 Special Design Provisions for Wind and Seismic ( SDPWS). To help translate what the latest changes to building codes mean for opportunities in wood construction, the American Wood Council (AWC) recently introduced four new standards that are adopted by reference in the 2015 International Building Code ( IBC) and the 2015 International Residential Code ( IRC). By Buddy Showalter, PE Photo © BigStockPhoto/flippo
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |