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.
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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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.
A bryan readling p e responds.
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.