How useful is it to tie single rows of rack to the wall?

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It is generally not suggested to tie racks to the wall mainly because lateral forces generated from the building can be transferred to the racks and vice versa forces from the racks being transferred to the building, mainly applicable in  seismic geographical zones. If wall ties are used, synchronization between the building civil engineer and the rack designing engineer should exist to ensure that the ties and any transmitted forces will not damage the rack or the building structures. The connection to the wall must be capable of transferring the required forces, and the connectors must be compatible with the wall material.  If the height to depth ratio is such that a single row needs extra stability, heavy- duty anchor patterns with larger base plates or cross aisle tie configurations could be used rather than wall ties.