What is the minimum percentage of sound wood required for installing through braces?

What is the minimum percentage of sound wood required for installing through braces?

• A. 30% or more sound wood
• B. 50% or more sound wood
• C. 70% or more sound wood
• D. Any amount of sound wood

Answer: (A)

Through braces depend on solid, healthy wood around the fastener points to anchor the brace and to transfer loads from the weakened area into living tissue. If the wood around where you drill and bolt is largely decayed, the fasteners won’t have enough sound material to grip, and the repair can fail as decay progresses or the bolt holes split. Having at least 30% sound wood means there is enough intact tissue to bite into, to resist the forces applied by the brace, and to distribute stress without quickly worsening the injury. When less than that, the brace won’t be reliable, so alternative stabilization methods should be considered.

Through braces depend on solid, healthy wood around the fastener points to anchor the brace and to transfer loads from the weakened area into living tissue. If the wood around where you drill and bolt is largely decayed, the fasteners won’t have enough sound material to grip, and the repair can fail as decay progresses or the bolt holes split. Having at least 30% sound wood means there is enough intact tissue to bite into, to resist the forces applied by the brace, and to distribute stress without quickly worsening the injury. When less than that, the brace won’t be reliable, so alternative stabilization methods should be considered.