Different types of flat roofs

Different types of flat roofs

Different types of flat roofs

Though they may look good, and are very common, flat roofs do require routine maintenance and detailed repair in order to effectively prevent water infiltration.

With a variety of choices with roof models, flat roofs have not been left out of other popular types of roofs like tile, copper or slate roofs. They are just as important and require even more attention. In order to avoid throwing away money on short-term repairs, you should know exactly how flat roof systems are designed, the various types of flat roofs that are available, and the importance of routine inspection and maintenance.

There are four most common types of flat roof systems. These include (listed in order of increasing cost and durability): roll asphalt, single-ply membrane, multiple-ply or built-up, and flat-seamed metal.

Used since the 1890s, asphalt roll roofing generally consists of one layer of asphalt-saturated organic or fiberglass base felts that are applied over roof felt with nails and cold asphalt cement and usually covered with a granular mineral surface. The seams are typically covered over with a roofing compound. It can last about 10 years.

One of the lates roofing material is the single-ply membrane. It noramlly replace multiple-ply roofs. Though your roofing contractor can usually give a ten to 12 years of warranty, a correct installaion and maintenance is crucial for this type of roofing.

Multiple-ply or built-up roofing, also known as BUR, is made of overlapping rolls of saturated or coated felts or mats that are interspersed with layers of bitumen and surfaced with a granular roofing sheet, ballast, or tile pavers that are used to protect the underlying materials from the weather. This type of roofing usually lasts for about ten to thirty years but it would still depend on the quality of the materials that were used.

The last type is the flat-seamed roofing which has been existing since the early 1900s. Made from small pieces of sheet metal soldered flush at the joints, it can last many decades depending on the quality of the material, maintenance, and exposure to the elements.

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