Asphalt Tack / Prime Coat Quantity
Emulsion gallons to order for a tack or prime coat.
Example
You enter
- Area to shoot (ft²) 10000
- Residual application rate (gal/sy) 0.04
- Emulsion asphalt residue (%) 60
You get
- Area 1111.1 sy
- Undiluted (gal/SY) 0.066667
- Emulsion gallons 74.07
- Residual asphalt 44.4 gal
Details, formula, and sources
The DOT spec sets a residual (asphalt) rate but the truck meters emulsion, so the residue fraction grosses the order up. A 0.04 gal/sy residual over a 10,000 sf lane needs 74 gal of a 60%-residue emulsion, not the 44 the residual figure alone suggests.
area_sy = area_sf / 9; undiluted_gal_sy = residual_rate_gal_sy / (residue_pct / 100); emulsion_gallons = undiluted_gal_sy x area_sy; residual_gallons = residual_rate_gal_sy x area_sy.
Coverage identity by name (residual-to-emulsion gross-up); DOT tack/prime-coat application-rate practice.
The residual-over-residue-fraction coverage identity is public paving practice; state DOT tack-coat specs are free.
Estimate. AHJ and licensed professional govern.
Field names used by the API: area_sf, residual_rate_gal_sy, residue_pct, area_sy, undiluted_gal_sy, emulsion_gallons, residual_gallons
- Residual rate 0.04 gal/sy default tack (the DOT spec or engineer governs; prime is higher)DOT paving spec
- Residue fraction 60% default (SS/CSS emulsions run ~55-65%); the supplier data sheet governsemulsion data sheet