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A flat roof is a roof which is almost level in contrast to the many types of sloped roofs. The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10°. [ 1 ] Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof .
The roof of an earth shelter may not be covered by earth (earth berm only), or the roof may support a green roof with only a minimal thickness of earth. Alternatively a larger mass of earth might cover the roof. Such roofs must deal with significantly greater dead load and live load (e.g. increased weight of water in the earth after rain, or snow).
Cattle breeds fall into two main types, which are regarded as either two closely related species, or two subspecies of one species. Bos indicus (or Bos taurus indicus ) cattle, commonly called zebu, are adapted to hot climates and originated in the tropical parts of the world such as India, Sub-saharan Africa, China, and Southeast Asia.
This is a list of some of the cattle breeds considered in the United States to be wholly or partly of American origin. Some may have complex or obscure histories, so inclusion here does not necessarily imply that a breed is predominantly or exclusively American.
Beefalo constitutes a hybrid offspring of domestic cattle (Bos taurus), usually a male in managed breeding programs, and the American bison (Bison bison), usually a female in managed breeding programs. [1] [2] The breed was created to combine the characteristics of both animals for beef production.
Romosinuano are beef cattle, and are noted for their docile temperament and adaptation to subtropical climates. [2] Romosinuano lines also exist in Costa Rica and Venezuela , [ 3 ] and have been imported to the United States for cross-breeding in the hopes of improving cattle production in Florida and similar states.
However, beef cattle can also be bred through artificial insemination, [1] depending on the cow and the size of the herd. Cattle are normally bred during the summer so that calving may occur the following spring. [1] However, cattle breeding can occur at other times of year. Depending on the operation, calving may occur all year round.
The finished roof's thickness is usually between 30 and 120 mils (thousandths of an inch; 0.75 mm to 1.50 mm). The most commonly used cured elastomer membranes are ethylene propylene diene monomer (commonly EPDM) and neoprene, although all thermoset products combined fail to account for more than 10% of all commercial roofing. This is in part ...