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  2. 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).

  3. Federal roofing tax credit for energy efficiency - Wikipedia

    en.wikipedia.org/wiki/Federal_Roofing_Tax_Credit...

    This credit is for funds spent on the energy-star approved materials, not on installation or labor cost. For example, if the roofing materials cost $5,000 and the labor expense was $5,000, resulting in a total cost of $10,000, a tax filer would still only receive the maximum tax credit of $1,500.

  4. Membrane roofing - Wikipedia

    en.wikipedia.org/wiki/Membrane_roofing

    The finished roof's thickness is usually between 30 and 120 mils (thousandths of an inch; 0.75 mm to 1.50 mm). The most commonly used cured elastomer membranes are ethylene propylene diene monomer (commonly EPDM ) and neoprene, although all thermoset products combined fail to account for more than 10% of all commercial roofing.

  5. Asphalt roll roofing - Wikipedia

    en.wikipedia.org/wiki/Asphalt_roll_roofing

    The shingles produced in 1939 were sufficient to cover more than 1,000,000 dwellings, assuming an average size of 10 squares per roof. In two surveys of roofing materials in 20 Eastern States, - made during 1938, the kinds of roofing materials on 20,841 dwellings along 4,038 miles of highway were tabulated.

  6. Reflective surfaces (climate engineering) - Wikipedia

    en.wikipedia.org/wiki/Reflective_surfaces...

    As part of the new efforts, DOE will install a cool roof, whenever cost-effective over the lifetime of the roof, during construction of a new roof or the replacement of an old one at a DOE facility. In October 2013, the United States Department of Energy ranked Cool Roofs as a 53 out of 100 (0 to 100 weighted average) for a cost-effective ...

  7. Roof pitch - Wikipedia

    en.wikipedia.org/wiki/Roof_pitch

    Roof pitch is the steepness of a roof expressed as a ratio of inch(es) rise per horizontal foot (or their metric equivalent), or as the angle in degrees its surface deviates from the horizontal. A flat roof has a pitch of zero in either instance; all other roofs are pitched .

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