Knee braces are needed to prevent a frame from racking in the wind. Often the frame will be cut such that knee braces are the same size and any brace can be used anywhere on the frame. The shed frame I am working on calls for knee braces that are set at 45 degrees and have a 30” rise and 30” run. The braces can be used in any position on the frame.
These knee braces are 3” x 5”. When I cut these on the TimberKing 1220, I cut them at 3 1/8” x 5 1/8”. This gives me a little room for shrinkage and when we assemble the frame for test fitting, they can be pared to fit if needed. Some guys run their brace material through a planner to make sure they are starting with stock that is dead on 3” x 5”.
Drawings for Brace
All angles are 45 degrees.
Directions for Cutting the Brace
I normally cut with a circular saw and then finish the cuts with a handsaw. Others might use a band saw or radial arm saw. Whatever works is fine. If you use a circular saw, before you start, make sure the saw blade is squared up.