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.
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.
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.
If preferred install the floor brace after installing the vertical braces.
When the narrow sections of the wall on each side of the opening are not reinforced or braced the weakness is worse.
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