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A cost estimate is the approximation of the cost of a program, project, or operation.The cost estimate is the product of the cost estimating process. The cost estimate has a single total value and may have identifiable component values.
In Australia, this type of carpenter is called a roof carpenter and the term roofer refers to someone who installs the roof cladding (tiles, tin, etc.). The number of roofers in Australia was estimated to be approximately 15,000. New South Wales is the largest province with an 29% market share in the Australian Roofers industry (4,425 companies).
The United Union of Roofers, Waterproofers and Allied Workers (UURWAW or RWAW) is a union of roofers and waterproofing personnel, headquartered in Washington, D.C. As of 2008 [update] , the union has approximately 22,000 members organized into nine district councils across the United States .
Roof orientation and ventilation can extend the service life of a roof by reducing temperatures. [13] Shingles should not be applied when temperatures are below 10 °C (50 °F), as each shingle must seal to the layer below it to form a monolithic structure. The underlying exposed asphalt must be softened by sunlight and heat to form a proper bond.
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