Bracing is a structural element or system added to a framed wall or roof to resist lateral forces, like wind or seismic loading, that would otherwise cause the structure to rack or shift sideways, a type of movement conventional vertical framing alone doesn’t effectively resist.
Without adequate bracing, a framed structure could distort under lateral load even if each individual framing member is perfectly capable of carrying its intended vertical loads.
Various bracing methods exist, from diagonal wood or metal braces to structural sheathing panels, each providing lateral resistance through slightly different mechanisms.
What Types of Bracing Are There?
- Diagonal let-in or metal strap bracing
- Structural sheathing panels acting as shear walls
- Cross-bracing in specific structural applications
- Engineered bracing systems for specific seismic or wind requirements
Why Is Bracing Important?
A structure without adequate lateral bracing is vulnerable to racking, a sideways distortion that can crack finishes, misalign doors and windows, or in severe cases contribute to structural failure during a significant wind or seismic event. Modern construction most commonly relies on structural sheathing panels, functioning as shear walls, to provide this lateral resistance rather than the diagonal let-in bracing more common in older construction.
Building codes specify minimum bracing requirements based on a building’s height, wind exposure, and seismic zone, meaning bracing requirements can vary considerably between a low, sheltered structure and a taller building in a high-wind or seismically active region. Consulting an engineer for the specific requirements applicable to a given site and design ensures adequate protection. This diligence provides real peace of mind against significant lateral forces.
Bracing vs. Shear Wall
Bracing is the general term for any lateral-resisting structural element. A shear wall is one specific and now very common bracing method, using structural sheathing panels to resist lateral loads rather than diagonal braces or other alternative bracing types.