GMB Scotland said the two-day strike in September will cause disruption in schools after members rejected a pay offer.
Unison has yet to announce the results of its strike ballot to members.
"Cosla has refused to seriously engage with our members during what has been a protracted, frustrating process. If they had, parents and pupils would not now be facing disruption.A Cosla spokeswoman said council leaders had made a "strong offer" which clearly illustrates the value they place on their workforce.
Schools closures were expected across Scotland this time last year due to planned council strikes which included non-teaching staff. This wasIn November teachers joined mass rallies in the first national schools strike in over a decade - resulting in the closure of nearly every primary and secondary school in the country, and many council nurseries.
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