Flat roofing can be instaled above a shingled roof if installed properly, however it is not usually a good idea to put shingles above a flat roof, the grainuals from the shingles can wash down onto the flat roof which usually will wareout the flat roof and may cause a leak.

thanks, James W. Cook (Thumb Area Construction).

don't let water damage your home or building, let us protect you with new gutters. new gutters are low cost and a very good way to protect your self from costly repairs caused by watter damage.