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In my opinion it is necessary. The rolling brings the roots of the grass into firm contact with the soil so that soil moisture is available to the roots and the sod can "knit" with the soil sooner. Rolling isn't for smoothing out the bumps. That is done by proper site preparation before laying the sod. If you don't roll it, explain to the customer that you are cutting corners on doing a proper job.
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Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways - Beer in one hand - Nacho's in the other - body thoroughly used up, totally worn out and screaming : Woo Hoo, what a ride!
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