The volume of a prism is the product of the area of the base and the distance between the two base faces, or the height (in the case of a non-right prism, note that this means the perpendicular distance).
In 2017, most homeowners are paying between $2.87 and $3.85 per watt to install solar, and the average gross cost of solar panels before tax credits is $16,800. Using the U.S, average for system size at 5 kW (5000 watts), solar panel cost will range from $10,045 to $13,475 (after tax credits). Thatâs nine percent lower than it was a year ago, and solar panel system costs are continuing to fall.
A metal roof is lightweight, durable, fire-resistant and does not rot. A professionally installed steel roof can be $5,100-$22,000 for steel roofing on a simple one-story ranch-style house; aluminum runs $11,900-$24,200 for the same roof; and copper jumps to $25,500-$39,600. A slate roof is one of the most long-lasting roof materials available.