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    Both types of roofing have a surface coating of tiny rock granules for UV-protection, like an asphalt shingle roof, and both appear similar to each other from a distance. The difference is that modified bitumen roofing is a heavier roof material with a longer life expectancy of 10 to 16 years. It is fully adhered with a cold adhesive spread over the underlayment or secured by heating in place with a propane torch. There is also self-adhering version

    Roll roofing and modified bitumen are both suitable for low-slope roofs. Modified bitumen is approved for “flat” roofs with minimal slope, but roll roofing is not viable below a 2/12 pitch (two inches of rise for each twelve inches of horizontal run) with exposed nails, or a maybe little lower with concealed nail installation.

While we hope you find this series of articles about home inspection helpful, they should not be considered an alternative to an actual home inspection by a local inspector. Also, construction standards vary in different parts of the country and it is possible that important issues related to your area may not be covered here.
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