An application of bitumen applied hot with a mop or mechanical applicator to the substrate or to the felts of a built-up roofing membrane.

In roofing, a layer of hot bitumen mopped between plies of roofing felt. Full mopping is the application of bitumen by mopping in such a manner that the surface being mopped is entirely coated with a reasonably uniform coating. Spot Mopping is the procedure of applying hot bitumen in a random fashion of small daubs, as compared to full mopping. Sprinkle mopping is a special application of installing insulation to the decks. It is done by dipping a roof mop into hot bitumen and sprinkling the material onto the deck. Strip Mopping is the application of bitumen in parallel bands.

The application of hot asphalt or coat tar using a mop or mechanical applicator to the surface or plies of a roofing membrane.

The application of hot asphalt with a mop or mechanical applicator to the substrate or to the plies of a bituminous roof. There are four types of mopping: (1) Solid - a continuous coating; (2) Spot- asphalt is applied in spots, leaving a grid of unmopped, perpendicular areas;(3) Strip - asphalt is applied in parallel bands, generally 8 inches (203 ram) wide and 12 inches (305 mm) apart; (4) Sprinkle - asphalt is shaken onto the substrate from a broom or mop in a random pattern.