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Depending on how it is mixed, sometimes very dry, concrete curbing can be very easily damaged before it has cured. The really decorative curbing can even be “scuffed” or “gouged” by the landscape install crews 24 to 36 hours after installation. We used to work with a contractor that installed some really interesting decorative curb and small patio combinations. They were all textured or shaped with multiple color combinations. The problem with it was we had to keep our guys away from it for at least 72 hours. Four days was better. Even then we made up little ramp / bridges to roll our wheel barrows over.
Ideally the landscape curbing guy should come in after the irrigation lines have been buried, finish grading has been completed, all boulders have been set and the trees are in. That way all you have left is sod, plants, sprinkler heads, drip completions and top dressing or gravel. Unfortunately that means sometimes you have to pull all or most of they crew off the job for a few days.
If the curbing is decorative, I would call the original contractor back to repair it. If it’s just square grey curb, you can probably repair it yourself if you have an employee with a little concrete finishing experience.
If your project manager is the home owner, I might suggest to him that he should pay for the repair since the curbing should have been scheduled later in the job. All concrete needs to cure before it can support anything heavy.
Hope that helps.
Bill
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