Hi, i have an older maybe 60 yr. old custom cape cod with big dormer. Above the dormer the roofing material started to blow away last night after heavy winds. My father in law called the material cold roll or something like that. It looks like wide, maybe 3 or 4 ft. heavy roofing rolls layed down. Anyway, the roof is in bad shape and needs replaced. Also, the pitch isn't steep at all, and it is easy access to this roof, i just climb out my window and small ladder up. Probably measures about 20x15ft., somewhere around 300 sq. ft. Is this hard to replace? How hard to tackle this job, what needs to be done? I need professional suggestions please! I am thinking about a rubber roof.