Years ago and also now sometimes, it was a 3/4 inch board between driveway sections.
or a cut in the concrete after its poured
or
a smaller strip set in maybe 1/4 inch wide.
Whats best- is it still ok to ask the concrete guy to use the 3/4 boards? Seems like that worked for a long time.
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Bump
I think the only time they used board separations it was either for decoration, or they were mixing small batches & couldn't pour a monolithic slab. IMHO single pour, and cut control joints, are best...