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  2. Metal roof - Wikipedia

    en.wikipedia.org/wiki/Metal_roof

    The connection wires run under the ridge cap at the top of the roof. Efficiency ranges from 10–18% but costs only 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 2.1–3.1 kg/m 2 (7–10 oz/sq ft

  3. Structural steel - Wikipedia

    en.wikipedia.org/wiki/Structural_steel

    Structural steel. Structural steel is a category of steel used for making construction materials in a variety of shapes. Many structural steel shapes take the form of an elongated beam having a profile of a specific cross section. Structural steel shapes, sizes, chemical composition, mechanical properties such as strengths, storage practices ...

  4. Open web steel joist - Wikipedia

    en.wikipedia.org/wiki/Open_web_steel_joist

    In structural engineering, the open web steel joist (OWSJ) is a lightweight steel truss consisting, in the standard form, of parallel chords and a triangulated web system, proportioned to span between bearing points. The main function of an OWSJ is to provide direct support for roof or floor deck and to transfer the load imposed on the deck to ...

  5. Cost estimate - Wikipedia

    en.wikipedia.org/wiki/Cost_estimate

    A cost estimate is the approximation of the cost of a program, project, or operation. The cost estimate is the product of the cost estimating process. The cost estimate has a single total value and may have identifiable component values. A problem with a cost overrun can be avoided with a credible, reliable, and accurate cost estimate.

  6. Sheet metal - Wikipedia

    en.wikipedia.org/wiki/Sheet_metal

    Manufacturers' Standard Gauge for Sheet Steel is based on an average density of 41.82 lb per square foot per inch thick, [11] equivalent to 501.84 pounds per cubic foot (8,038.7 kg/m 3). Gauge is defined differently for ferrous (iron-based) and non-ferrous metals (e.g. aluminium and brass).

  7. Corrugated galvanised iron - Wikipedia

    en.wikipedia.org/wiki/Corrugated_galvanised_iron

    Industrial buildings are often built with and covered by trapezoidal sheet metal. [7] Many materials today undergo the corrugation process. The most common materials for corrugated iron are ferrous alloys (e.g. stainless steels), aluminium and copper. Regular ferrous alloys are the most common due to price and availability.

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