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  2. 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 ...

  3. When Was the Last Time You Got Your Roof Inspected? - AOL

    www.aol.com/last-time-got-roof-inspected...

    New roof costs depend on the type of roof your home has, its size, and the materials you use. Learn how to maintain, repair, and choose a new roof wisely. ... Learn how to maintain, repair, and ...

  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. Methods of computing square roots - Wikipedia

    en.wikipedia.org/wiki/Methods_of_computing...

    A method analogous to piece-wise linear approximation but using only arithmetic instead of algebraic equations, uses the multiplication tables in reverse: the square root of a number between 1 and 100 is between 1 and 10, so if we know 25 is a perfect square (5 × 5), and 36 is a perfect square (6 × 6), then the square root of a number greater than or equal to 25 but less than 36, begins with ...

  6. Green roof - Wikipedia

    en.wikipedia.org/wiki/Green_roof

    A properly designed and installed extensive green-roof system can cost $108–$248/m 2 ($10–$23/sq ft) while an intensive green roof costs $355–$2,368/m 2 ($33–$220/sq ft) However, since most of the materials used to build the green roof can be salvaged, it is estimated that the cost of replacing a green roof is generally one third of the ...

  7. 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. A cost ...

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