Simple Solutions for Code-Compliant Wall Construction is your leading resource for building safe, durable and code-compliant walls that are energy-efficient and cost-effective.

This site compiles APA’s extensive library of free wall-construction content—including design recommendations, how-to instructions, CAD details for wood-frame construction, and more—into one convenient location.View the Additional Resources page for a summary of available resources.

Browse current wall construction topics in the menu at left, or scroll down to view News & Updates for our latest recommendations.

Free Product Support & Training

For answers to your questions about wall bracing systems and engineered wood products, contact the APA Help Desk for free product support.

APA also offers continuing education opportunities, including training and consultation on wall construction topics. If you are interested in scheduling a live or online presentation for your group, contact your local APA Engineered Wood Specialist.

News & Updates

APA Wall Bracing Calculator

The APA Wall Bracing Calculator is a free online tool that simplifies the process of designing residential wall bracing for compliance with the 2009, 2012, 2015 and 2018 International Residential Code.

The Wall Bracing Calculator’s step-by-step tool uses basic user inputs and internal calculations to determine the amount of wall bracing needed for each house plan and to comply with IRC bracing requirements. It also provides a concise printable package of the design, including layouts, for inclusion in plan submittals.

The easy-to-follow system automatically determines how much bracing is required, whether there is enough qualified bracing, and whether all the IRC placement rules have been met. Along with streamlining the calculations, it verifies compliance without the user having to sift through pages and pages of code.

The Wall Bracing Calculator can be accessed at

Nail-Base Sheathing for Siding and Trim Attachment

Wood structural panels, including plywood and OSB, are recognized by the building codes for their strength and performance in wall construction. Walls continuously sheathed in plywood or OSB also provide an excellent nail base for siding and trim. In typical construction, siding, trim, and brick ties are attached to framing members. According to the code, they can also be attached directed to nail-base structural sheathing when the correct fastening method is used. APA's new guide, Nail-Base Sheathing for Siding and Trim Attachment, Form Q250, provides an easy method for determining the type and spacing of siding fasteners to satisfy building code requirements when using wood structural panel sheathing as a nail base. For more information on using structural sheathing as a nail base for siding and trim, visit Nail-Base Sheathing.

Simplified Wall Bracing Video: Four Steps to Code-Compliant Walls

This video from APA introduces an easier way to determine IRC-compliant wall bracing: APA’s simplified wall bracing method. The video outlines how APA’s simplified wall bracing method greatly reduces the complexity of determining whether wall bracing meets the code for many common home designs.

Simplified Wall Bracing: Four Steps to Code-Compliant Walls explains the basics of the method and how the method helps to determine bracing for qualified designs with four steps:

  1. Determine whether the design meets the parameters of the method.
  2. Draw a rectangle around the plan; determine the amount of bracing required for each side of the rectangle.
  3. Define wall bracing segments.
  4. Compare existing bracing to bracing required.

The two-and-a-half-minute video introduces the simplified method and two publications that go into more depth on it: Bracing Method Streamlines Design, Form P310, a quick-reference brochure that provides an overview of the method, including key benefits and a comparison with traditional bracing, and APA System Report SR-102: APA Simplified Wall Bracing Method Using Wood Structural Panel Continuous Sheathing, Form SR-102, a complete description of how to apply the method.

To watch the video and to learn much more about the simplified method, visit the Simplified Wall Bracing Method page.

APA presents Wall Bracing: Satisfy the code with strong, resilient, fully sheathed walls

Shot on location in Washington, IL, where a devastating tornado destroyed nearly 1,000 homes in November 2013, this video uses real-world examples from the reconstruction of the town. Key principles to creating strong, resilient, IRC-compliant walls are explained in the context of this rebuilding effort.

To watch the video and to learn much more about APA-recommended wall bracing techniques, visit the Wall Bracing page.

System Report: Using Wood Structural Panels with Raised-Heel Trusses

APA outlines an efficient, cost-effective construction solution for using wood structural panels with raised-heel (or energy-heel) trusses in the System Report, Use of Wood Structural Panels for Energy-Heel Trusses, Form SR-103.

Conventional trusses can compress insulation, diminishing its R-value and creating a cold area in the building envelope at the point where the truss meets the top wall plate. Energy-heel trusses provide sufficient space for full-depth insulation without compromising the effectiveness of the attic insulation R-value. For this reason, construction with raised-heel trusses is an increasingly popular practice.

Because the International Residential Code (IRC) requirements for attaching raised-heel trusses are complex, APA System Report SR-103 provides a pre-engineered solution to this problem: combine raised-heel trusses with wood structural panels to resist loads that act on the truss connection. The construction method outlined meets the lateral load and wind uplift load requirements of the IRC without additional cutting or blocking, and strong, stable wood structural panels are very easily joined to the building.

APA System Report SR-103 is available for free download in PDF format or purchase from APA in print format for $1.00.

Free Advanced Framing CAD Details from

Twenty CAD details highlighting advanced framing techniques are available on, APA’s online resource for building designers and construction professionals in search of CAD details for wood-frame construction. The details are adapted from figures in APA's Advanced Framing Construction Guide, Form M400. All of the details are available to download free of charge in four file formats: DWG, DWF, DXF and PDF.