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  2. Metal roof - Wikipedia

    en.wikipedia.org/wiki/Metal_roof

    A metal roof is a roofing system featuring metal pieces or tiles ... Efficiency ranges from 10–18% but costs only about $2.00–$3.00 per watt of installed capacity ...

  3. How Much Does it Cost to Replace a Roof? - AOL

    www.aol.com/much-does-cost-replace-roof...

    The typical roof replacement will range between $4 to $11 per square foot. The higher the square footage, the more your roof replacement will cost. For a 1,500 square foot roof, homeowners can ...

  4. Flat roof - Wikipedia

    en.wikipedia.org/wiki/Flat_roof

    A study by Ducker International in 2005 identified the average cost per year of a metal roof to be US$3.2 per square metre ($0.30/sq ft) while single-ply roofs stood at $6.1/m 2 ($0.57/sq ft) and built-up roofing at $4.0/m 2 ($0.37/sq ft).

  5. Structural steel - Wikipedia

    en.wikipedia.org/wiki/Structural_steel

    Structural steel roof at Manchester ... 275 or 355 denotes the yield strength in newtons per square millimetre or the ... Cost is commonly the primary controlling ...

  6. Domestic roof construction - Wikipedia

    en.wikipedia.org/wiki/Domestic_roof_construction

    The primary roof covering [5] on houses in North America are asphalt shingles, but some have other types of roof shingles or metal roofs. Tile and thatch roofs are more common in Europe than North America. Some roofing materials help reduce air conditioning costs in hot climates by being designed to reflect light.

  7. Rooftop solar power - Wikipedia

    en.wikipedia.org/wiki/Rooftop_solar_power

    The connection wires run under the ridge cap at the top of the roof. Efficiency ranges from 10–18% but only costs about $2.00–$3.00 per watt of installed capacity, compared to monocrystalline which is 17–22% efficient and costs $3.00–$3.50 per watt of installed capacity. Thin film solar is light weight at 7–10 ounces per square foot.

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