This circuit has a power source, a complete path for electrons to flow, and a resistor as the load. An electric circuit is a path in which electrons from a voltage or current source flow. Electric current flows in a closed path called an electric circuit.
A service will typically charge $660 which includes labor and material, to clean the exterior of a 1200-square-foot house. You can rent a power washer for $160 a day and do the job and save75 percent.
As to the cost makeup, you will find metal shake roofs on the market with contractor pricing set at $130-$180 per 100sf. You need to add 15-20% for accessories, then labour, permits, disposal costs and don't forget the workers compensation rates that run over 40%.