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2012 Wood Frame Construction Manual for One- and Two-Family Dwellings & Commentary to the WFCM

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Overview

The 2012 Wood Frame Construction Manual (WFCM) for One- and Two-Family Dwellings was developed by the American Wood Council (AWC) Wood Design Standards Committee. The 2012 WFCM represents state of the art design for one and two family dwellings in regions with high winds, high seismic risk or large snow loads.

The WFCM provides engineered and prescriptive design requirements for wood frame construction used in one and two-family dwellings. The provisions of the WFCM are based on dead, live, snow, seismic and wind loads derived from provisions of the ASCE 7-10 Minimum Design Loads for Buildings and Other Structures.

Limits to the 2012 WFCM are based on the following:

  • 70 psf ground snow loads, balanced and unbalanced snow loads considered
  • 110-195 mph, 700-year return period, 3-sec gust basic wind speeds (strength design)
  • Seismic Design Categories A-D

The 2012 WFCM is referenced in the following Codes:

  • 2012 International Building Code
  • 2012 International Residential Code

 

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Details
Publisher:
AWC

In general, the framing systems described in the WFCM utilize repetitive member wood assemblies. The WFCM includes general information on loads and resistances. The limitations of applicability are provided in Chapters 2 and 3. Chapter 2 provides minimum loads for buildings within the scope of this document for the purpose of establishing specific resistance requirements. Note that Chapter 2 also contains some necessary construction details. These details have been derived from typical code provisions and are included in Chapter 2 for the convenience of the designer. Chapter 3 provides several prescriptive solutions derived from Chapter 2 load requirements. Therefore, it is perfectly acceptable to use Chapter 3 provisions for parts of a design and Chapter 2 for other parts.

The primary changes to the 2012 WFCM include:

  • Design load provisions are based on ASCE 7-10
  • Wood structural panels are permitted to resist wind uplift
  • Shear wall story offset provisions are clarified
  • Design values for lumber, engineered lumber and fasteners are based on the 2012 NDS
  • Engineering design values for horizontal diaphragm  and vertical wall assemblies are in accordance with SDPWS-08
  • Header tables include dropped and raised header conditions