To estimate the amount of bitumen required for theprime coat, multiply the area to be treated by the rate ofapplication. Under certain conditions, the estimateshould include sufficient bitumen for an additionalwidth of 1 foot on each side of the surface course to beconstructed on the primed base.The formulas for a prime coat estimate are as follows:For computing gallons:For computing drums:Tack CoatA tack coat is a coating of asphalt on an existing pavedsurface that provides a bond between the existing surfaceand the new surface, The two essential properties of a tackcoat are as follows: (1) it must be very thin and (2) it mustuniformly cover the entire surface of the area When tack8-28
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