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While they may look good and are very common, flat roofs require general maintenance and repair detail to effectively prevent water infiltration. If done correctly, you'll be happy with your flat roof for a very long time. The flat roofs aren't as attractive and / or popular as their newer counterparts, such as slate, tile, or copper roofs. However, they are just as important and require further attention. To avoid throwing away money on short-term repairs, you should know that there are various types of flat roofs that are available, and the importance of routine inspection and maintenance.A flat roof system works by providing a waterproof membrane over a building. It consists of one or more layers of hydrophobic material that is placed over a structural deck. There are four most common types of flat roof systems. Listed in order of durability and increasing cost, are: roll asphalt, single-ply membrane, multiple-metal drive or urbanized, and flat-stitched. Multi-drive or roofing urbanized, also known as an office, is made of overlapping rolls of the felts or mats that are saturated or covered with layers of bitumen blend and emerge with a sheet of roofing, ballast, or paver tile granular used to protect the underlying material against time. BURS is designed to last 10 to 30 years, depending on the materials used. Ballast, or aggregate stone gravel or crushed water-worn stuffed into a layer of asphalt or tar from coal. Since the ballast or tile pavers cover the membrane, makes the inspection and maintenance of the seams of the roof difficult. Past-sewn flat roofs have been used since the nineteenth century. Made of small pieces of sheet metal welded to flush at joints, may last many decades depending on the quality of materials, maintenance, and exposure to the elements. Galvanized metal requires regular painting to avoid corrosion and split seams need to be resoldered. Other metal surfaces, such as copper, may be marked with holes and pinholes from acid raid and usually require replacement. Today, copper, lead-coated copper, and stainless steel alloy of lead and tin-coated flat roofs are favored as durable.

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