I need to replace my current roof. My roof is a flat type roof and I was wondering what type of roofing I should replace it with? Should I use the modified or incorporated in covered with tar / gravel bitumen. What would last longer and easier to maintain? I have been experiencing any escape and moldings in the house and the roof is in poor condition. Well, I have the answer. EPDM Roofing is the only way to go. Old and hot tar roofing gravel were known to leak, and very difficult to solve. The rubber covers are available in various thicknesses that translate into various warranty periods. If you intend to stay in the house for the long term, buy the best you can afford. A twenty-year residential warranty is minimal with the norm is thirty years or more. Have the roof installed by a reputable contractor and save all your warranty documents as many of them are trannsferable to a new owner. Good luck with your roofing project.