topping joint

topping joint

[′täp·iŋ ‚jȯint]
(civil engineering)
In concrete finishing, a small space or break set at regular intervals, particularly over expansion joints, to allow for contraction and expansion of the topping layer.

topping joint

In a topping, 1, a joint which is directly over an expansion joint in the concrete base.
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References in periodicals archive ?
If sanding doesn't work or the entire wall has brush marks, save yourself time and effort by applying a thin coat of topping joint compound over the walls using a 12-in.