![]() If you do not include them, you will see a huge discrepancy between this estimate and one from a contractor, because he WILL include these.ģ) Enter the length of parapet walls (and metal cap). Penetrations require special flashing work and will add significant cost for each unit. to the total roof area, which can cost as much as $1,000 or more.Ģ) Enter the exact number of large penetrations / curbs (hatches, skylights and/or chimneys). 12″ overhang over 100 foot eave span adds 100 sq. If there are overhangs, be sure to include these into the Dimensions field. How To Use Flat Roof Calculatorġ) Measure your house/building from corner to corner. flat roof costs $8,000 – 16,000, depending on the material you choose. The average cost to replace a flat roof is $5-10 per square foot. ![]() In recent years flat roofs have grown in popularity because of their distinctly modern look, as well as ease of installation and repair.
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