If preferred install the floor brace after installing the vertical braces.
Second story seismic corner bracing garage door.
In a single storey house you need to brace at least 50 percent of the length of each cripple wall while in a two story house you need to cover at least 80 percent of the length.
For example in some cases the code will call for a 4 foot sheathed section on both sides of a garage door opening or at the house corner or flanking an entry door interfering with the.
Studies have shown that walls containing garage doors perform poorly when subjected to lateral wind and seismic forces.
This is especially true when the wall containing the garage door is offset by more than a few feet from other braced wall lines parallel to the garage door see illustration below.
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Install a 2 by 4 on the garage floor at the base of the door to act as a base for the brace with the length extending just beyond the door hinges.