The large opening of a garage door and the weight of a second story room built over the garage can result in the walls being too weak to withstand earthquake shaking.
Second story seismic corner bracing garage door.
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.
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If preferred install the floor brace after installing the vertical braces.
Studies have shown that walls containing garage doors perform poorly when subjected to lateral wind and seismic forces.
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.
For instance in a single story house if the cripple wall is 48 long you need to cover 24 which could be accomplished with a 4 panel at each end and two 8.